Al-Mu'ayyad Da'ud ibn Yusuf

Al-Malik al-Mu'ayyad Da'ud ibn Yusuf was the fourth Rasulid sultan of Yemen. A younger son of al-Muzaffar Yusuf I, he came to the throne in 1296 after the death of his brother al-Ashraf Umar II and ruled until 1321.

Two daughters of Umar II were married to sons of Da'ud, binding the two branches of the ruling house. On his death in 1321 he was succeeded by his own son.