Shimeon Kippah also known as פטר חמור

http://folkmasa.org/bet/bet001.htm

http://www.ybm.org.il/Admin/uploaddata/LessonsFiles/Pdf/4570.pdf

https://www.yutorah.org/_cdn/_shiurim/Fast%20of%20Ninth%20of%20Teves.pdf

http://chaimsimons.net/tevet9paper.pdf