Little is known of the ancestry of the Yorkshire branch of the Calverts. At the knighting of Leonard's son George Calvert, it was claimed that his family originally came from Flanders (a Dutch-speaking area today across the English Channel in modern-day Kingdom of Belgium). 
23 Aug 1550 
He was the son of John George Calvert and Dorothy Margerie Lennard. 
George Calvert's father, Leonard was a country gentleman who had achieved some prominence as a tenant of Lord Wharton. 
He was wealthy enough to marry a "gentlewoman" of a noble line, Alicia or Alice Crossland (or sometimes spelled: "Crosland"). 
He established his family on the estate of the later-built Kiplin Hall, near Catterick in Richmondshire, of Yorkshire. 
His mother Alicia/Alice died on 28 November 1587, when he was fifteen years old.
"Calvert's father, (an earlier) Leonard, was a country gentleman who had achieved some prominence as a tenant of Lord Wharton, 
Leonard, George Calvert's father, was wealthy enough to marry a "gentlewoman" of a noble line, Alicia or Alice Crossland (or sometimes spelled: "Crosland"). He established his family on the estate of the later-built Kiplin Hall, near Catterick in Yorkshire." Browne, William Hand (1890). George Calvert and Cecil Calvert: Barons Baltimore of Baltimore. New York: Dodd, Mead, and Company. p. 3. Cited by Wikipedia. George Calvert Accessed March 3, 2018. jhd </ref>
In 1569, Sir Thomas Gargrave had described Richmondshire as a territory where all gentlemen were "evil in religion", by which he meant predominately Roman Catholic; it appears Leonard Calvert was no exception. During the reign of Queen Elizabeth I, continuing the changes wrought in the previous century by her father, King Henry VIII making the Monarch, the supreme authority of the Christian Church in England, continuing the pace Protestant Reformation from the Continent of Europe, with the political, spiritual and temporal separation from the Roman Catholic Church and the Pope/Papacy in Rome, therefore the Royal Government exerted authority over the matters of religious faith, practices and the Church. Acts mandating compulsory religious uniformity were enacted by Parliament and enforced through penal laws.
The Acts of Supremacy and the Uniformity Act of 1559 also included an oath of allegiance to the Queen and an implicit denial of the Pope's (then Pope Paul IV) authority over the English Church. This oath was required of any common "subject", who wished to hold high office, attend university, or take advantage of opportunities controlled by the state (king/kingdom).
The Calvert household suffered the intrusion of the Elizabethan-era religious laws. From the year of George's birth onwards, his father, Leonard Calvert was subjected to repeated harassment by the Yorkshire authorities, who in 1580 extracted a promise of conformity from him, compelling his attendance at the Church of England services. 
His father then married Grace Crossland (or sometimes spelled: "Crosland"), Alicia's first cousin.
In 1592, when George was twelve, the authorities denounced one of his tutors for teaching "from a popish primer" and instructed Leonard and Grace to send George and his brother Christopher to a Protestant tutor, and, if necessary, to present the children before the commission "once a month to see how they perfect in learning". As a result, the boys were sent to a Protestant tutor called Mr. Fowberry at Bilton. The senior Calvert had to give a "bond of conformity"; he was banned from employing any Catholic servants and forced to purchase an English Bible, which was to "ly open in his house for everyone to read".
In 1593, records show that Grace Calvert was committed to the custody of a "pursuivant", an official responsible for identifying and persecuting Catholics, and in 1604, she was described as the "wife of Leonard Calvert of Kipling, non-communicant at Easter last".
Married 1575 @ hurstmoncaux castle, Sussex England to Grace Alicia Hawnsworth Crossland
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