Pope Gregory IV

Pope Gregory IV (; c. 795-25 January 844) was an Italian priest of the Roman Catholic Church and the 102nd Pope from 11 February 731 to 28 November 741.
was Pope from October 827 to 25 January 844. 
Early life.
Gregorius was born in Rome, but the exact date is unknown.
Cardinal.
Gregory was a Cardinal and head priest of the Basilica of St. Mark in Rome.
Pope.
Gregory was elected pope in 844. 
During his reign, the Roman port city of Ostia was expanded.