From CNN:
An unknown thief snatched an 800-year-old skull believed to be of Saint Zdislava of Lemberk from a display box in a church in the northern Czech Republic and ran away with the relic, police said on Wednesday. A fuzzy security camera photo showed a silhouette dressed in black, with what police said was the skull of Zdislava of Lemberk in their hands, running between the benches in the St. Lawrence and St. Zdislava basilica in Jablonne v Podjestedi, 110 km (68 miles) north of Prague, on Tuesday.
Saint Zdislava of Lemberk lived from 1220 to 1252 and was known for her generosity and work for the poor. She was canonized by Pope John Paul II in 1995.