“Most serene and Powerful King [Ferdinand], most Clement Lord,... The portraits of the serene daughters of your Majesty will be done in two days, and I shall take them to Venice, whence – having finished them with all diligence – I shall send them quickly to your Majesty. As soon as your Majesty has seen them, I am convinced I shall receive much greater favours than those which have been previously done me, and so I recommend myself humbly to your Majesty.”

In a letter to the Duke of Mantua, from Bologna, 10 March 1533; as quoted by J.A.Y. Crowe & G.B. Cavalcaselle in Titian his life and times - With some account..., publisher John Murray, London, 1877, p. 370
The portrait which Titian took home and repeated a second time he doubtless sent to Charles V. The replica was not sent to Mantua till after 1536, but there it appears to have remained. Another example besides that of the Madrid Museum came into the hands of Charles the First of England.
1510-1540
Source: https://commons.wikimedia.org/wiki/Titian#/media/File:Tizian_081.jpg
Source: https://commons.wikimedia.org/wiki/Titian#/media/File:Tizian_081.jpg

Letter to Edward Seymour, Lord Protector (28 January 1549), quoted in Leah Marcus, Janel Mueller and Mary Rose (eds.), Elizabeth I: Collected Works (The University of Chicago Press, 2002), p. 24.

In a letter to the Duke Alfonso of Ferrara, From Venice, April 1, 1518; as quoted by J.A.Y. Crowe & G.B. Cavalcaselle in Titian his life and times - With some account ..., publisher John Murray, London, 1877, p. 181-82
1510-1540

Source: Autobiography of Andrew Carnegie, 1920, Chapter XXIX

In a letter to Cardinal Farnese in Rome, from Venice 24th December 1547; after the original in Rochini's 'Belazione' u.s. pp. 9-10; as quoted in Titian: his life and times - With some account of his family... Vol. 2., J. A. Crowe & G.B. Cavalcaselle, Publisher London, John Murray, 1877, pp. 164-165
Titian had to chose between Pope & Emperor when they were on the worst of terms; he decided to obey the Emperor Charles V who ordered Titian to come to his court at Augsburg, Germany
1541-1576

Quote in Gainborough's letter, 24 Feb. 1757 from Ipswich, to a correspondent in the neighbouring town of Colchester; as cited in Thomas Gainsborough, by William T, Whitley https://ia800204.us.archive.org/6/items/thomasgainsborou00whitrich/thomasgainsborou00whitrich.pdf; New York, Charles Scribner's Sons – London, Smith, Elder & Co, Sept. 1915, p. 20
1755 - 1769

Prayer for Easter Sunday in the Ordos Desert of Inner Mongolia published in article “The Priest Who Haunts the Catholic World” Saturday Evening Post (12 October 1963)
Context: Since once again, O Lord, in the steppes of Asia, I have no bread, no wine, no altar, I will raise myself above those symbols to the pure majesty of reality, and I will offer to you, I, your priest, upon the altar of the entire earth, the labor and the suffering of the world.
Receive, O Lord, in its totality the Host which creation, drawn by your magnetism, presents to you at the dawn of a new day. This bread, our effort, is in itself, I know, nothing but an immense disintegration. This wine, our anguish, as yet, alas! is only an evaporating beverage. But in the depths of this inchoate Mass you have placed — I am certain, for I feel it — an irresistible and holy desire that moves us all, the impious as well as the faithful to cry out: "O Lord, make us one!"

Memorandum of February, 1588.
Conyers Read, Lord Burghley and Queen Elizabeth (London: Jonathan Cape, 1960), pp. 418-9.

Source: Nation