Cecil Calvert, 2nd Baron Baltimore in the context of "Province of Avalon"

The Province of Maryland was an English and later British colony in North America from 1634 until 1776, when the province was one of the Thirteen Colonies that joined in supporting the American Revolution against Great Britain. In 1781, Maryland was the 13th signatory to the Articles of Confederation. The province's first settlement and capital was in St. Mary's City, located at the southern end of St. Mary's County, a peninsula in the Chesapeake Bay bordered by four tidal rivers.

The province began in 1632 as the Maryland Palatinate, a proprietary palatinate granted to Cecil Calvert, 2nd Baron Baltimore, whose father, George, had long sought to found a colony in the New World to serve as a refuge for Catholics at the time of the European wars of religion. Palatines from the Holy Roman Empire also immigrated to Maryland, with many settling in Fredrick County, with Maryland Palatines (Palatine German: Marylandisch Pälzer) reaching a population of 50,000 by 1774.

George Calvert, 1st Baron Baltimore (/ˈbɔːltɪmɔːr/; 1580 – 15 April 1632) was an English politician. He achieved domestic political success as a member of parliament and later Secretary of State under King James I. He lost much of his political power after his support for a failed marriage alliance between Prince Charles and the Spanish House of Habsburg royal family. Rather than continue in politics, he resigned all of his political offices in 1625 except for his position on the Privy Council and declared his Catholicism publicly. He was created Baron Baltimore in the Peerage of Ireland upon his resignation. Baltimore Manor was located in County Longford, Ireland.

Calvert took an interest in the British colonization of the Americas, at first for commercial reasons and later to create a refuge for persecuted Irish and English Catholics. He became the proprietor of Avalon, the first sustained English settlement on the southeastern peninsula on the island of Newfoundland (off the eastern coast of modern Canada). Discouraged by its cold and sometimes inhospitable climate and the sufferings of the settlers, he looked for a more suitable spot further south and sought a new royal charter to settle the region, which would become the state of Maryland. Calvert died five weeks before the new Charter was sealed, leaving the settlement of the Maryland colony to his son Cecil. His second son Leonard Calvert was the first colonial governor of the Province of Maryland.

Leonard Calvert (c. 1606 – 9 June 1647) was an English-born colonial administrator who served as the first proprietary governor of Maryland from 1634 to 1647. He was the second son of George Calvert, 1st Baron Baltimore, the first lord proprietor of the Province of Maryland. His elder brother Cecil, who inherited the colony and the title upon the death of their father in 1632, appointed Leonard as governor of Maryland in his absence.

Charles Calvert, 3rd Baron Baltimore (August 27, 1637 – February 21, 1715) was an English colonial administrator. He inherited the province of Maryland in 1675 upon the death of his father, Cecil Calvert, 2nd Baron Baltimore. He had been his father's Deputy Governor since 1661 when he arrived in the colony at the age of 24. However, Charles left Maryland for England in 1684 and would never return. The events following the Glorious Revolution in England in 1688 would cost Calvert his title to Maryland; in 1689 the royal charter to the colony was withdrawn, leading to direct rule by the British Crown. Calvert's political problems were largely caused by his Roman Catholic faith which was at odds with the established Church of England.

Calvert married four times, outliving three wives, and had at least two children. He died in England in 1715 at the age of 78, his family fortunes much diminished. With his death he passed his title, and his claim to Maryland, to his second son Benedict Leonard Calvert, 4th Baron Baltimore (1679–1715), his eldest son Cecil having died young. However, Benedict Calvert would outlive his father by just two months, and it would fall to Charles' grandson, Charles (1699–1751), who converted to the Anglican faith, to see the family proprietorship in the Province of Maryland restored by the king.