As far as I know and have read, the Wacdaan and Geledi alliance came into existence after the two clans ousted the oppressive Silcis group that ruled the Shabelle Valley and were allied with the Ajuraan. Records say that Ajuraan were ousted from Mogadishu and Southern Somalia by an Hiiraab alliance. And Wacdaan Cusmaan and Abgal Cusman (various subclans of Abgal that migrated to Mogadishu/Benadir) then had conflict in which Wacdaan Cusmaan was pushed from Mogadishu and to around Mogadishu, in example to Lafoole (few miles westwards oustide of Mogadishu), Nimow (few miles southwards of Mogadishu) and around the Shabelle in Afgoye region.
http://i241.photobucket.com/albums/ff28 ... 1194561052Afgoye city was first known as the Geledi city-state in which the Geledi Sultanate ruled. Wacdaan and Geledi were allied in the defense of that Sultanate, but the Wacdaan had their own independent pastoral leadership. This became clear in Wacdaan's unilateral response to the Italian encrouchments on their lands, while the Sultan of Geledi was hesistant.
Before 1991, Wacdaan saw themselves as just that like every other clan in Somalia. After things got out of hand, like other Somali clans, they started to integrate into larger groupings: hence the use of Mudulood now.
In culture and way of living, they are closer to Geledi..except for the pastoral nomads that lived between Lafoole and Mogadishu who share more with the Wacbudan Abgal.
I've read that during the Arta conference Wacdaan made their own suldan to represent them which led to confusion since Geledi Sultan claimed to represent the Wacdaan too since that was tradition. But the Wacdaan said that they came under Mudulood and thus had their own suldan.