Mordecai Grimes (d. 1840) was a farmer who lived in Collinsport in 1840. He was the father of Mildred Ward and Jeremy Grimes. Mordecai was not on very good terms with the Collins family. He strongly believed in witchcraft and was convinced that Quentin Collins was a warlock because his herd of cattle were mysteriously killed on Collins property. He believed that Quentin killed them so he could steal his land from him, even though Quentin repeatedly said he wanted to purchase it.