Robert Barker was an English politician. He was the Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 for Colchester

Colchester (UK Parliament constituency)

Colchester is a parliamentary constituency represented in the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament by the first past the post system of election.-History:...

, Essex 1597-1621.

He may have been the Robert Barker who entered Trinity College, Cambridge

Trinity College, Cambridge

Trinity College is a constituent college of the University of Cambridge. Trinity has more members than any other college in Cambridge or Oxford, with around 700 undergraduates, 430 graduates, and over 170 Fellows...

 in 1581 and graduated BA from Pembroke College

Pembroke College, Cambridge

Pembroke College is a constituent college of the University of Cambridge, England.The college has over seven hundred students and fellows, and is the third oldest college of the university. Physically, it is one of the university's larger colleges, with buildings from almost every century since its...

a few years later.

He became a JP for Essex in 1605 (until 1617) and was made Serjeant-at-Law for Colchester in 1612. He was elected as MP for Colchester in 1597, 1601, 1604 and 1614.