400–480), also spelled Qusayy, Kusayy, Kusai, or Cossai, born Zayd (Arabic: زيد),[1] was an Ishmaelite descendant of Abraham.

When a quarrel broke out between Qusai and some members of the tribe of Rabi'ah, they reproached him and betrayed the fact that they never regarded him as one of their own.

[4] When Qusai came of age, Hulail ibn Hubshiyyah the chief of Banu Khuza'a tribe was the trustee and guardian of the Ka'bah.

He distributed the responsibilities of looking after the visitors during pilgrimage, taking care of the Kaaba, warfare, and pacifying amongst myriad tribes living in Mecca.

However Qusai preferred his first born, Abd-al-Dar, although he was the least capable of all so he singled out Abd Manaf his second son for his honor and prestige.

Shortly before Qusai's death he invested all his rights, powers, and transferred the ownership of the House of Assembly to Abd Manaf.