Martinus Gosia was one of the glossators and a 12th century Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 jurist

Jurist

A jurist or jurisconsult is a professional who studies, develops, applies, or otherwise deals with the law. The term is widely used in American English, but in the United Kingdom and many Commonwealth countries it has only historical and specialist usage...

, counted among the Four Doctors of Bologna

Four Doctors of Bologna

The Four Doctors of Bologna were Italian jurists and glossators of the 12th century, based in the University of Bologna: Bulgarus, Martinus Gosia, Jacobus de Boragine and Hugo de Porta Ravennate....

, the others being Bulgarus

Bulgarus

Bulgarus was a twelfth century Italian jurist, born at Bologna. He is sometimes erroneously called Bulgarinus, which was properly the name of a jurist of the 15th century....

, Hugo de Porta Ravennate and Jacobus de Boragine.

Martinus Gosia and Bulgarus were the chiefs of two opposite schools at the University of Bologna

University of Bologna

The Alma Mater Studiorum - University of Bologna is the oldest continually operating university in the world, the word 'universitas' being first used by this institution at its foundation. The true date of its founding is uncertain, but believed by most accounts to have been 1088...

, corresponding in many respects to the Proculians and Sabinians of the Roman Empire

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

. Martinus was at the head of a school which accommodated the law to what his opponents styled the equity of the purse (aequitas bursalis), whilst Bulgarus adhered more closely to the letter of the law. The school of Bulgarus ultimately prevailed.