Isaac Ambrose (1604-1662) was the son of Richard Ambrose of Ormskirk, Lancashire. Isaac graduated from Brasenose in 1624 and became the minister of Castleton, Derbyshire. He then became one of the king's itinerant preachers and became a vicar in Preston. In 1654 he became minister at Garstang. In the 1662 Great Ejection he was ejected from Garstang. He died soon after in Preston.
Some of his writings are available here: http://www.prdl.org/author_view.php?a_id=1385