The Serer people of Senegal, the Gambia and Mauritania are patrilineal ("simanGol" in Serer language) as well as matrilineal ("tim" ). There are several Serer matriclans and matriarchs. Some of these matriarchs include Fatim Beye (1335) and Ndoye Demba (1367) – matriarchs of the Joos matriclan which also became a dynasty in Waalo (Senegal). Some matriclans or maternal clans form part of Serer medieval and dynastic history, such as the Guelowars. The most revered clans tend to be rather ancient and form part of Serer ancient history. These proto-Serer clans hold great significance in Serer religion and mythology. Some of these proto-Serer matriclans include the "Cegandum" and "Kagaw", whose historical account is enshrined in Serer religion, mythology and traditions.