Jahsh ibn Riyab (Arabic: جحش بن رئاب), was a companion of Muhammad.
He married Umayma bint Abd al-Muttalib, a member of the Hashim clan and aunt of Muhammad,[2] and they had six children.
It is said that Jahsh emigrated to Abyssinia and joined Sa'd ibn Abi Waqqas in overseas military conquests.
“The Chams of Cambodia ascribe their conversion to one of the fathers-in-law of Muhammad”[25] named "Geys" (Jahsh).
“The Chinese Muhammadans have a legend that their faith was first preached in China by a maternal uncle of the Prophet, and his reputed tomb at Canton is highly venerated by them.”[26] What later generations misconstrued as the tomb of "Geys" appears to have been a mausoleum dedicated to his memory in Hami, 400 miles east of Ürümqi in Xinxiang.