Linguere Ndoye Demba Joos Fadiou, also known as Ndoye Demba in Senegambian dynastic history, was a Serer princess from the Kingdom of Sine (now part of present-day Senegal), from the later half of the 14th century to the 15th century. The royal title – "Lingeer" means Queen or Royal Princess. She was given in marriage to the Brak of Waalo – Caaka Mbaar Mbooj (variation : Brac Thiaka Mbar). The surname Mbooj is the English spelling in the Gambia, variation include Mboge. In French speaking Senegal, it is spelt Mbodj. Differences in spelling is due to the colonial past of the Gambia and Senegal. France colonized Senegal, whilst Britain colonized the Gambia, thus the division of the two countries. Caaka Mbaar was the second king of Waalo from the Mbooj patrilineage, who ruled in the second half of the 14th century, around 1367. Brak was the title of the kings of Waalo. Lingeer Ndoye Demba was the founder of the Serer Joos Maternal Dynasty (variations : Dyoss, Diouss-Fahou, Dious-Fadiou, Dieuss, Dihosou, also "Diouss" – the French spelling in Senegal) of Waalo. In the Wolof Kingdom of Waalo, Lingeer Ndoye Demba is considered the matriarch of the Joos maternal clan. In the Serer Kingdom of Sine, it is her grandmother Lingeer Fatim Beye (variations : Fa-tim Beye or Fatimata Beye) who is considered to be the matriarch this maternal dynasty. In the Serer language, the word "Fa-tim" means "the maternal clan of ... ". The Serer surname Beye (var : Bèye) is also one of the many Serer maternal clans.

Lingeer Ndoye Demba's marriage to Brak Caaka Mbaar took place in the Kingdom of Sine (the country of her birth). She was given in marriage to the King of Waalo during his visit to Sine. After the marriage, she accompanied her husband to the Kingdom of Waalo where she received great hostility from the two established maternal clans : the Tedyek Maternal Dynasty (of Fula origin) and the Loggar Maternal Dynasty (of Moor origin). The king's mother was a Loggar and his first wife (Lingeer-Awo Yassin Tanor) was a Tedyek. These three maternal dynasties ruled the kingdom of Waalo with the Mbooj paternal family. For nearly six hundred years, these three maternal clans engaged in dynastic wars among themselves. The Battle of Nder (var : Ndeer) which is still celebrated in Waalo, began as a dynastic war between the Joos Maternal Dynasty (maternal descendants of Lingeer Ndoye Demba, of Serer origin) and the Tedyek, where the Joos family massacred several members of the Tedyek maternal clan.

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