The Sublime Post is a revised version of Choon Hwee Koh’s 2020 Yale dissertation. It provides a lucid analysis of the Ottoman postal system and discusses how its ordinary components were part of and contributed to the gradual transformation of imperial bureaucracy. Drawing on Baki Tezcan’s ‘Second Empire’ thesis that the Ottoman empire evolved into being a constitutional state after the early seventeenth century, she introduces the concept of the ‘thickening governance’ to describe the growing interdependence between state institutions and society. Ordinary subjects recruited as local intermediaries—or partners as Ali Yaycıoğlu would call them—gradually became an intrinsic part of the administrative functioning. Koh argues that these actors not only gained bureaucratic experience but also developed collective organisational capacity, fostering a process of co-evolution between state and society. The postal system, initially a tool of central control, became embedded in the empire’s social fabric and became a domain of negotiations between the central administration and its local partners and rivals.
The book is divided into eight chapters, each addressing a specific, often overlooked element of the postal system. Avoiding grand comparisons or overarching narratives, Koh instead focuses on the micro-level workings of the postal infrastructure and offers a detailed account of its daily operations. In chapter one, Koh offers a general overview of the postal network and explores why it often failed to operate effectively. She identifies the hierarchy of status inherent in the Ottoman social and administrative system as a key explanation: the empire’s social order normalised practices like arbitrary confiscation of horses when the system of horse procurement encountered difficulties. Within the framework of layered empire where the overlapping structures of authority were highly fragmented, officials were often aware of inefficiencies, but they were constrained by geography and hierarchy. Reform efforts existed, yet they were often delayed or undermined by the very system they aimed to improve. According to Koh, the difficulties were systemic rather than anomalous. Chapter two focuses on the ulak, or courier, a central yet often invisible figure in the Ottoman postal system. Koh seeks to uncover their role and agency within imperial communication networks by relying on scarce direct evidence. Most imperial documents provide little information on who carried the messages, and they portray couriers as mere functionaries of central administration. She argues that couriers—though unnamed and rarely described—were essential to the daily functioning of the empire. They traversed long distances, difficult terrains, and unstable political borders, enabling the flow of information that sustained governance. By drawing attention to these overlooked individuals, Koh underscores that imperial power was enacted not only through institutions and edicts but also through the movement, risk, and labour of those at the margins of the historical record.
Chapter three explores the shift from ulak to tatar, reflecting the Ottoman empire’s efforts to formalise and institutionalise its communication networks. While the ulak held a loosely defined role, the tatar emerged as a more institutionalised figure within the postal network. This change was not merely semantic but indicative of a broader reconfiguration of imperial communication. Koh links this transformation to the empire’s growing emphasis on regularity, speed, and coordination. The Ottomans sought to discipline space and communication through mapped routes and time through standardised schedules. This synchronisation marked a turning point in the eighteenth century and signalled the administrative consolidation of the postal system. The fourth chapter examines imperial decrees as institutional responses to what Koh calls a ‘reverse salient,’ a concept that she borrows from Thomas Hughes to describe areas that need better organisation rather than innovation. Koh argues that Ottoman bureaucrats recognised inefficiencies in the postal network and responded not with innovation but through a series of ad hoc decrees. These aimed at regulating routes, imposing time discipline, and strengthening oversight. The decrees, she suggests, were less about reforming the system radically and more about managing persistent weaknesses through administrative reconfiguration. In this way, they served as practical tools for addressing the fragmentation and friction inherent in the empire’s growing communication infrastructure. Chapter five focuses on the transformation of the bookkeeper’s role in the Ottoman postal system, especially in the light of two key imperial decrees. Koh asks how, between 1690 and 1760, traditional tax collectors evolved into more autonomous figures within an emerging postal bureaucracy. Bookkeepers took on expanded duties beyond basic accounting that enabled the implementation of reformist goals under Mustafa II (r. 1695–1703). As intermediaries, they helped translate imperial visions into bureaucratically acceptable practices. This new administrative role laid the foundation for a more rationalised and coordinated postal infrastructure.
Chapter six views the postmaster as a local intermediary bridging imperial authority and village life. Often mistaken for tax farmers, postmasters had a distinct role: managing postal stations. By the eighteenth century, their duties expanded to include bookkeeping, and the records they produced enhanced surveillance by central bureaucrats. Koh presents the postmaster as both a state agent and a village resident shaped by local politics. This dual role challenges centralised views of Ottoman governance by showing how imperial infrastructure functioned within local contexts. The chapter emphasises that the Sublime Post relied not only on central orders but also on rural communities that supplied horses, provisions, and labour. Villagers and local actors are often overlooked figures in Ottoman postal history, and Koh gives them their due in chapter seven. She uses the term ‘villager’ broadly to include rural farmers, urban merchants, artisans, elders, teachers, and religious leaders. Rather than passive subjects, these groups are shown as organised and capable of collective action. Koh argues that bureaucrats increasingly recognised and mobilised these local units to support imperial goals. Far from being disconnected, such communities had internal structures that enabled them to sustain functions like the relay system. The chapter demonstrates that Ottoman infrastructure relied not only on formal governance but also on collaboration between officials and local social groups.
The final chapter addresses the natural and political disruptions that hindered information flow in the Ottoman empire. Koh emphasises the empire’s chronic cash shortages and the differing strategies employed by central and local bureaucrats during crises. These variations, rather than showing fragmentation, illustrate what she calls ‘thickening governance,’ the deepening of imperial authority through multilevel engagement. Local officials often acted independently to keep communication running. Though their solutions didn’t always align with the centre, this flexibility ensured continuity. Koh thus argues that Ottoman governance functioned not through strict centralisation but through negotiated, layered interactions between centre and periphery.
The Sublime Post contributes significantly to our knowledge on the communication infrastructure of the Ottoman empire. Koh’s choice of prioritising empirical detail over broad comparisons is particularly effective. By tracing the movement of information through everyday actors—couriers, bookkeepers, postmasters, and villagers—she highlights the structural importance of these figures. Her archival research is both rich and precise, and her use of the concept of ‘thickening governance’ connects daily practices with broader institutional shifts. The study offers a compelling bottom-up perspective on Ottoman rule, challenging centralised models.
Yet ironically, the book’s micro-level approach sometimes leads to analytical overreach. Koh assembles many minor and vaguely interconnected elements—horses, decrees, supply chains—into a single model of imperial infrastructure. At times, conclusions drawn from specific local cases appear overly ambitious. Her method seeks to recover the layered realities of administration by paying close attention to small-scale actors and their local contexts. But the drive to build a coherent system-wide interpretation occasionally undermines that very sensitivity to complexity. The book does not fully address a central question: How were the ruptures and silences within premodern governance perceived by those in power, particularly in Istanbul? In trying to draw broad conclusions from a limited set of localised cases, the analysis risks implying an absent or unaware state. However, the Ottoman empire often operated through fragmented logics and ad hoc practices that were inconsistent but pragmatically effective. Koh’s effort to weave coherence from such irregular patterns, while admirable, sometimes leads her into interpretive difficulty—where the search for structure overshadows the messiness that defined imperial rule on the ground.
