The Joos Maternal Dynasty (Serer: Joos Fadiou/Fadioudj, other variations: Dioss Fahou/Fadiou, Dyoss, Dieuss, Dihosou, Diouss, Dyoos or Djeus) was a Serer maternal dynasty which originated from the Serer pre-colonial Kingdom of Sine in the 14th century and spread to the Wolof Kingdom of Waalo. The matriarch or founder of this maternal dynasty was Lingeer Fatim Beye, a princess and queen originally from the Kingdom of Sine. In Waalo, it was founded by the princess Lingeer Ndoye Demba of Sine. Lingeer Ndoye Demba was the maternal granddaughter of Lingeer Fatim Beye. They both came from the Serer ethnic group. Although the pre-colonial Kingdoms of Sine and Waalo now form part of modern-day Senegal, in pre-colonial Senegambia, present-day Gambia had open-borders with Senegal and share the same