In the year 1086, 15 families and 3 slaves lived in Hartley. Before the Black Death (1348) about 150 persons lived here. 53 persons made tax payments in 1377, which means about 85 lived here then. In 1392 a paper tells us that there was a chief house, where a manager lived. He farmed land for the owner. This land was called Hartley Court. Other persons who owned land in Hartley, had to go to the court of the owner and do some other work for him. 