1580 – He was born this year in Yorkshire, England. He is the son of Leonard and Alice Crossland Calvert.
1594 – He matriculated at Oxford in this year at the age of 14, graduating in 1597.
1617 – His active part in examining Irish grievances led to knighthood in this year. Following his conversion to Catholicism, Calvert resigned as secretary of state. As a reward for his service, James I gave him the Irish title of Baron Baltimore.
1623 – He had held stock in the Virginia Company and was a member of the Council for New England. In this year, he obtained a royal charter to found a private colony in Newfoundland. He received the powers of a "Bishop of Durham," a medieval authority, which meant that the proprietor could exercise feudal control over the land, award titles of nobility, and dominate the government of any colony he established.
1627 – This year, he visited Avalon and later returned with his second wife and children, leaving in England only his eldest son Cecilius. Because of the bitter arctic cold and French attacks, the colony proved a failure.
1629 – Without giving up his proprietary hopes, Baltimore looked southward, arriving in Jamestown, Va., in this year. However, his religion and interest in a proprietary colony antagonized the Virginians, who forced Baltimore to return to England.
1632 – Shortly before the charter gained final approval in this year, Calvert died on the 15th day of April this year in his lodgings at Lincoln’s Inn Fields at the age of 52. The grant was completed in the name of his heir, Cecilius, who proceeded with the colonization of Maryland.