What is "guelowar"

The Guelowar (many variations: Gelwaar, Guelwaar, Guelwar, Gelwar etc.) was the maternal dynasty in the Serer pre-colonial kingdoms of Sine and Saloum (in the Senegambia, but mainly in the western area of present-day Senegal). They were from the Mandinka ethnic group. The offsprings of Mandinka women and Serer men became the kings of Sine and Saloum. The dynasty lasted from the mid-14th century to 1969, in which year both kings died.