You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Martin_Luther

Context:
Some priests and former religious had already married, including Andreas Karlstadt and Justus Jonas, but Luther's wedding set the seal of approval on clerical marriage. He had long condemned vows of celibacy on Biblical grounds, but his decision to marry surprised many, not least Melanchthon, who called it reckless. Luther had written to George Spalatin on 30 November 1524, "I shall never take a wife, as I feel at present. Not that I am insensible to my flesh or sex (for I am neither wood nor stone); but my mind is averse to wedlock because I daily expect the death of a heretic." Before marrying, Luther had been living on the plainest food, and, as he admitted himself, his mildewed bed was not properly made for months at a time.

Question:
What kind of marriage was this ?

clerical marriage