the military governor of a frontier province in medieval Germanya German nobleman ranking above a count (corresponding in rank to a British marquess)
英汉双解大词典
margrave/ˈmɑːˌɡreɪv/
1.
N（名词）
a German nobleman ranking above a count. Margraves were originally counts appointed to govern frontier provinces, but all had become princes of the Holy Roman Empire by the 12th century (古代德国边境省份的)总督