ملف:Jamshid bin Mas'ud bin Mahmud known as Ghiyath (d. 1429); al-Risala al-Kamaliya, Safavid Iran, dated 26 June 1520.jpg

English: JAMSHID BIN MAS'UD BIN MAHMUD KNOWN AS GHIYATH (D. 1429 AD): AL-RISALA AL-KAMALIYA

SAFAVID IRAN, DATED SATURDAY 25 RAJAB AH 1029/26 JUNE 1520 AD

Also known as Sullam al-sama (The Stairway of Heaven), a treatise on the distances and sizes of heavenly bodies, dedicated to a vizier designated only as Kamal al-Din Mahmud, by the celebrated author al-Kashi, Arabic manuscript on paper, 30ff. plus two modern fly-leaves, each folio with 16ll. of black cursive script verging on nasta'liq script, including diagrams and tables, with catchwords, with Persian seal impressions, colophon mentioning the date of completion and the date of copy, with Ottoman marbled paper doublures, in 18th century gilt and stamped morocco binding Folio 7 ½ x 4 ¾in. (19.1 x 12.2cm.)

According to the preface of this manuscript, the work is dedicated to a vizier Kamal al-Din Mahmud and bears the title of Al-risala al-kamaliya, probably in the patron's honour. This appears to be the same treatise as Sullam al-Sama (Stairways to heaven) recorded as being dedicated to vizier Kamal al-Din Mahmud and completed in March 1407 AD/21 Ramadan AH 809. This date appears in the colophon of the present manuscript.