Gąsawa massacre
1227 massacre of Piast-dynasty dukes in Gąsawa, Poland / From Wikipedia, the free encyclopedia
The Gąsawa massacre (Polish: Zbrodnia gąsawska, lit. 'Gąsawa crime') was an attack on the night of 23 / 24 November 1227 during a council of Polish Piast dukes which was being held near the village of Gąsawa in Kuyavia, Poland. The High Duke of Poland, Leszek the White, was assassinated, and Duke Henry the Bearded of Silesia was gravely wounded.[1][2]