Mogilno Falsification

The Mogilno Falsification (Polish: falsyfikat mogileński) is a medieval document, allegedly issued in Płock in 1065.

Among the properties of the abbey were 23 towns from Greater Poland and Kujawy, seven villages from Mazovia, and the income of five gords, located in the Lands of Łęczyca and Sieradz.

According to a late medieval chronicler Jan Długosz, the document was issued and signed by King Bolesław II the Generous.

This theory was disproved by researchers, who claim that the Mogilno Falsification comes from mid-12th century, when organizational structure of Polish Catholic Church was rebuilt.

The Falsification, regardless of its age, remained one of the most important sources describing early medieval settlements in northern and central Poland.