Ats Bonninga

Ats Bonninga (fl. 1494), was a Dutch noble, known for her defence of the fortress in Warns in Gaasterland during the conflict between the Schieringers and the Vetkopers party in 1494.

Daughter of van Lo(u)w Broers Bonninga and Hylck Feyckesd. van Harinxma and married to Jelmer Sytsma; her father was a member of the Schieringers. When her spouse was captured by the Vetkopers in 1494, she defended the fortress until she could have her spouse released and receive a promise of free evacuation.

Bonninga was the subject of many publications from 1522 and forward and played an important role in the national romanticism of Friesland in the 19th-century.