Question: In what year did Margaret Knox's spouse pass away?

Knowledge 1: Margaret Knox
Margaret Knox (née Stewart; 1547 – after 1612) was a Scottish noblewoman and the second wife of Scottish reformer John Knox, whom she married when she was 17 years old and he 54. The marriage caused consternation from Mary, Queen of Scots, as the couple had married without having obtained royal consent. [SEP] Knowledge 2: Presbyterianism
John Knox (1505–1572), a Scot who had spent time studying under Calvin in Geneva, returned to Scotland and urged his countrymen to reform the Church in line with Calvinist doctrines. After a period of religious convulsion and political conflict culminating in a victory for the Protestant party at the Siege of Leith the authority of the Church of Rome was abolished in favour of Reformation by the legislation of the Scottish Reformation Parliament in 1560. The Church was eventually organised by Andrew Melville along Presbyterian lines to become the national Church of Scotland. King James VI and I moved the Church of Scotland towards an episcopal form of government, and in 1637, James' successor, Charles I and William Laud, the Archbishop of Canterbury, attempted to force the Church of Scotland to use the Book of Common Prayer. What resulted was an armed insurrection, with many Scots signing the Solemn League and Covenant. The Covenanters would serve as the government of Scotland for nearly a decade, and would also send military support to the Parliamentarians during the English Civil War. Following the restoration of the monarchy in 1660, Charles II, despite the initial support that he received from the Covenanters, reinstated an episcopal form of government on the church.
Knowledge 1: Margaret Knox
Margaret Knox (née Stewart; 1547 – after 1612) was a Scottish noblewoman and the second wife of Scottish reformer John Knox, whom she married when she was 17 years old and he 54. The marriage caused consternation from Mary, Queen of Scots, as the couple had married without having obtained royal consent. [SEP] Knowledge 2: Siege of Boston
In November 1775, Washington sent the 25 - year - old bookseller - turned - soldier Henry Knox to bring to Boston the heavy artillery that had been captured at Fort Ticonderoga. In a technically complex and demanding operation, Knox brought many cannons to the Boston area by January 1776. In March 1776, these artillery fortified Dorchester Heights (which overlooked Boston and its harbor), thereby threatening the British supply lifeline. The British commander William Howe saw the British position as indefensible and withdrew the British forces in Boston to the British stronghold at Halifax, Nova Scotia, on March 17 (celebrated today as Evacuation Day).
Knowledge 1: Margaret Knox
Margaret Knox (née Stewart; 1547 – after 1612) was a Scottish noblewoman and the second wife of Scottish reformer John Knox, whom she married when she was 17 years old and he 54. The marriage caused consternation from Mary, Queen of Scots, as the couple had married without having obtained royal consent. [SEP] Knowledge 2: Knox United Church (Saskatoon)
Knox United Church is a designated municipal heritage building at 838 Spadina Crescent East, in the Central Business District, of Saskatoon, Saskatchewan, Canada.

Answer: 1572