In Islamic historiography, the concept of Sīrah did not develop in isolation, but rather through intricate interactions within a conceptual network of cognate terms. The primary problem of this study is reconstructing this conceptual network and explicating the semantic distinctions of Sīrah in relation to neighboring terms within book titles from the first five Hijri centuries. Employing a pragmatic and title-based analytical approach grounded in early bibliographical indices (fahāris), this research investigates the titles of both extant and non-extant works. The findings demonstrate that Sīrah, Maghāzī, Siyar, and Tārīkh are not interchangeable synonyms, but represent four distinct conceptual nodes structured around four focal dimensions: subject, action, norm, and temporality. Within this matrix, Sīrah serves as the core node characterized by a subject-oriented function aimed at religious modeling; Maghāzī embodies an action-oriented function centered on military campaigns; Siyar fulfills a norm-oriented function rooted in legal, jurisdictional, and political relations; and Tārīkh provides a time-oriented, annalistic framework. Consequently, book titles in early Islamic scholarship operated not merely as descriptive labels, but as structured epistemological markers reflecting authors’ systematic categorization of historical knowledge.