The House of Abdul-Muttalib of Banu Hashim comprised nobility in pre-Islamic Mecca. This was based on their hereditary duty to act as stewards and caretakers of the pilgrims coming to Mecca to worship at the Kaaba, the sacred shrine that in Islamic tradition was built by Ibrahim (Abraham) and his first-born son and heir Ismail (Ishmael) was a Monotheist site of worship.
https://en.wikipedia.org/wiki/Banu_Hashim