Charter of Duke Trpimir (Croatian: Povelja kneza Trpimira), also known as Trpimir's deed of donation (Croatian: Trpimirova darovnica) is the oldest preserved document of the Croatian law, the oldest from the court of one of the Croatian rulers and the first national document which mentions the Croatian name. Charter, dated to 4 March 852, is not preserved in its original form but in five subsequent transcripts out of which the oldest is from year 1568.