Claim: The Constitution of Medina was written by Muhammad.
Evidence: In Medina , Muhammad united the tribes under the Constitution of Medina.
The Constitution of Medina -LRB- دستور المدينة , Dastūr al-Madīnah -RRB- , also known as the Charter of Medina -LRB- صحيفة المدينة , Ṣaḥīfat al-Madīnah ; or : ميثاق المدينة , Mīthāq al-Madīnah -RRB- , was drafted by the Islamic prophet Muhammad shortly after his arrival at Medina -LRB- then known as Yathrib -RRB- in 622 CE -LRB- or 1 AH -RRB- , following the Hijra from Mecca.