Ali bin Muhammad al - Hosni was born in the village al - Ahani in the Sa'dah area in northern Yemen .
The Yemeni imamate in the highlands was often contested by rival claimants in this era .
Ali bin Muhammad al - Hosni was born in the village al - Ahani in the Sa'dah area in northern Yemeni .
The Yemeni imamate in the highlands was often contested by rival claimants in this era .