One source indicates that he had 37 sons.[1] The "Sudairi Seven" – the seven sons of King Ibn Saud and Hassa bint Ahmed – were the largest bloc of full brothers[4][5] and as a consequence, were able to wield a degree of coordinated influence and power.[6] Ibn Saud and Hassa bint Ahmed married twice;[7][8] their first marriage started in 1913[7] and may have produced a son, Prince Sa'ad (1914–19).[8] Hassa then married Muhammad bin Abdul-Rahman, the brother of Ibn Saud,[7][9] with whom she had a son, Prince Abdullah, the father of Fahd bin Abdullah bin Mohammed Al Saud.[10][11][12] Hassa and Ibn Saud married again in 1920,[7] and their second marriage produced seven sons and four daughters.[13]