Please see the extremely well documented biography at the Dictionary of National Biography, except that the Dictionary erroneously has George's marriage to Anne Wynne, not Anne Mynne.
Little is known of George's origins, except that he came from Yorkshire the son of Leonard Calvert, born about 1579. It appears that George's father was a Roman Catholic, although his father was compelled by law to have George tutored by a Protestant. George matriculated (entered) Trinity College, Oxford, at the age of 14 in 1593/4, and received his bachelor's degree in 1597, having studied foreign languages. At some point, he would have had to swear allegiance to the Crown, which would have included a denial that the Pope had authority over the Church of England. After Oxford, he studied law at Lincoln's Inn in London for three years.
George, gentleman of St. Martins-in-the-Field, married, by license, Anne Mynne, of Hertfordshire, daughter of John Mynne, a Protestant, on November 22, 1604 at St. Peter's, Cornhill, London. He became the secretary and protege of Sir Robert Cecil, after whom he named his eldest son. His wife Anne died in 1622 and is buried at St. Martins-in-the-Fields, a Protestant church. George married his second wife, Joan ---, aft 1622.
Calvert held many high offices and was very involved in the foreign affairs of the Crown, but the political atmosphere and religious intolerance became intolerable, and in 1625 Calvert resigned his position as one of two Secretaries of State. When he resigned, the King, James I, confirmed Calvert's position on the Privy Council, and George was appointed Baron Baltimore in county Longford, Ireland. He converted to Catholicism, probably in late 1624.
George was very involved in the colonization of the New World. He invested in the Virginia Company, then in the East India Company. He purchased land in at Ferryland on the Alvan Peninsula, Newfoundland and established a colony there called Avalon. You can read about the settlement at Ferryland, Newfoundland and about the Avalon Peninsula at Wikipedia.
After the settlement at Avalon failed in 1629 due to an unusually harsh winter, Calvert tried to get a charter to establish a new colony in a warmer climate. He was denied a colony in Virginia, but he was final granted a charter for lands in Maryland. Unfortunately, it was too late, as Calvert had died five weeks earlier. His son Cecil, 2nd Baron Baltimore, inherited his father's title and lands. Cecil's younger brother, Leonard, was the first Proprietary Governor of the Maryland. Although George Calvert, 1st Baron Baltimore, never actually set foot in Maryland, he is considered its founder.
The Calvert's were known for their religious tolerance, allowing Catholic refugees as well as others, to settle in Maryland.
George Calvert died on April 15, 1632, at the age of 54. He is buried at St Dunstan-in-the-West Church, Fleet Street, City of London Greater London, England.
Please see the biography in the Archives of Maryland Biographical Series for George Calvert.
For more information, see the extensive biography of George Calvert, 1st Baron Baltimore at Wikipedia.
1st Lord of Baltimore
HoP. Mentions a 3rd wife, Mary Wynne, citing an obscure source.
DNB: Dictionary of national biography. New York: Macmillan, 1886. Open Library Vol. 8, Page 269
"Family Tree," database, FamilySearch (http://familysearch.org : modified 19 January 2018, 14:27), entry for George Calvert 1st Lord of Baltimore(PID https://familysearch.org/ark:/61903/4:1:MKZ5-KRK); contributed by various users.
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