This page http://26.1911encyclopedia.org/W/WI/WIDDRINGTON... says this about Ralph:
"Ralph Widdrington (d. 1688), was educated at Christ's College, Cambridge, where he made the acquaintance of Milton. In 1654 he was appointed regius professor of Greek at Cambridge, and in 1673 Lady Margaret professor of divinity."
He was also, according to Latham & Matthews, the tutor of John Pepys, Samuel's younger brother, at Christ's College.
WIDDRINGTON, RALPH (d.1688), regius professor of Greek at Cambridge; brother of Thomas Widdrington; B.A. Christ's College, Cambridge, 1633; fellow; public orator, 1650; regius professor of Greek, 1654; D.D., 1661; Lady Margaret professor of divinity, 1673.
---Dictionary of National Biography: Index and Epitome. S. Lee, 1906.
Chart showing the number of references in each month of the diary’s entries.