Writings on Temporal and Spiritual Authority

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Has any monk or nun ever left a monastery to be married to a king or queen?

In On the Temporal Power of the Pope: Against William Barclay (Writings on Temporal and Spiritual Authority, tr. Stefania Tutino), § "The first part of the fifth argument in support of the authority of the Supreme Pontiff in temporal matters is defended"; St. Robert Cardinal Bellarmine, S.J., thinks "it is a tale that"

the marriage of the daughter of King Roger, Constance, who, even though she was a nun, from a dispensation of Pope Clement III is said to have married Emperor Henry VI.197

[translator's n. 197:] the marriage between Emperor Henry VI and Constance, daughter of Roger II, king of Sicily, celebrated in 1186 and widely contested because it could potentially have led to the unification of the Holy Roman Empire with the kingdom of Sicily.

St. Robert's refutation:

Regarding Constance, Roger’s daughter, we think it is a tale that she, while being a nun and rather old in age, married Henry VI. In fact, Geoffrey of Viterbo, who used to instruct Henry VI in literature and in morals, writes that the marriage of Henry with Constance was celebrated in Milan in 1186 during the pontificate of Urban III, when Constance was thirty years of age. From this it follows that it would be false that Clement III or, as others say, Celestine III or, as others, Alexander III made a dispensation for her in her monastic vows; for the latter was dead already, and the others had not begun to sit on the papal throne yet. It would also be false that she married when she was old, of more than fifty years of age, and last, it would be false that she was previously a nun, since no one who lived in those times writes this. See Cardinal Baronius, volume 12 [vol. 19 of this ed., p. 546] of the Annals for the year 1186.

contains an English transl. of his De Laicis (On Laymen or Secular People), ref:12.1ff (PDF pp. , his ex professo(?) treatise on political philosophy.

p. 81 (PDF p. 134, ref:46.1):

The second error is made by those who go to the other extreme [from statesmen judging religion] and teach that kings must take care of their commonwealth and the public peace, but not religion. They teach that everybody should be allowed to believe and live as they wish, provided that they do not disturb the public peace. The pagans once found themselves in this error, for they approved every religion and admitted every philosophical sect, […]