Abstract: The treatise on the introduction of the principles of calligraphy from the circle and the dots, written by Muhammad ibn Ali Rawandi, is one of the oldest calligraphy teaching texts in the history of Iranian calligraphy, and is one of the most comprehensive treatises on calligraphy. It was written in the sixth century AH. This treatise can be considered one of the first surviving calligraphy teaching texts in the history of Iranian art. The writing of this treatise, while being short and avoiding formality, uses literary and poetic devices while teaching calligraphy. The placement of this treatise at the end of the book Raha al-Sudur and Ayah al-Surr, which, according to researchers, is a transcription of the book Seljuq-e-Qanamah by Khwaja Zahir al-Din Neyshaburi without citing the source, does not discredit it, considering the author's knowledge and calligraphic profession, and the introduction written on the treatise, which conveys his knowledge of the art of calligraphy and writing, as does the interpretations of the previous chapters of the book. This article, based on fundamental articles and using a descriptive and content analysis method, examines the process of formation of Rawandi's literary and artistic personality and the course of his artistic activity, while introducing and examining the importance of this treatise from the book Raha al-Sudur, its writing style, and its teaching of calligraphy in the art of calligraphy.