Bābā Rukn al-Dīn Shīrāzī, Masʿūd b. ʿAbd Allāh Bayḍāwī, was a scholar and Sufi sage of the 8th/14th century. He was originally from Bayḍāʾ, a dependency of the city of Ardakān in the province of Fārs. His date of birth is unknown. According to the author of Tārīkh-i Iṣfahān wa Rayy, he was a member of the Jābirī Anṣārī household (Jābirī Anṣārī, 325–326).

From early childhood Bābā Rukn al-Dīn displayed an interest in Sufism, and having become familiar with the lives and the spiritual knowledge of the Sufis, he embarked upon the Sufi path,…