Zayd ibn Umar

Zayd ibn Umar (Arabic: زيد بن عمر) was a son of the second Sunni Caliph, Umar; a grandson of the fourth Caliph and first Shia Imam, Ali; and a great-grandson of the Islamic prophet Muhammad.

He was the son of Umar and his wife Umm Kulthum bint Ali.

He was killed while trying to bring peace to his clan of Banu `Adi at the same time his mother Umm Kulthum died.

He left no descendants.

...
Wikipedia