Inscriptions—particularly those created during the Islamic period—constitute primary sources of significant artistic, cultural, political, and social value. Located on the southern slopes of the Alborz Mountains within the Tochal range, the village of Rudak hosts the shrine of Imamzadeh Mohammad-Baqer, whose wall bears a remarkable historical inscription. This study, conducted through a descriptive–analytical method based on both field observation and library research, aims to address three main questions: (1) to which historical period does the inscription belong? (2) what are its artistic and stylistic characteristics? and (3) who were involved in its construction and completion? Findings reveal that the inscription dates back to the Qajar era, specifically the reign of Fath-Ali Shah. Executed in Nasta‘liq script, the text conveys expressions of devotion and reverence toward Imamzadeh Mohammad-Baqer, in whose honor the inscription was installed. It also includes laudatory references to Fath-Ali Shah Qajar and mentions several individuals who contributed to its creation and completion. The technical features of the calligraphy are analyzed and compared with similar examples from the same period. Given that inscriptions often provide valuable insights into the historical context of architectural construction, the identity of builders and artists, and the sociocultural and political milieu of their time, the study of this particular example elucidates the artistic principles and aesthetic characteristics of Qajar epigraphy. Moreover, the chronogram indicating the date of execution has been identified and examined as part of the analysis.