Miserere (Latin: have mercy) is the first word of Psalms 50, 54 and 55, and the word appears on numerous occasions in Latin liturgical texts. There is a famous setting of Psalm 50 (= 51 in the Hebrew and English Psalter) by the early 17th century Italian composer Gregorio Allegri, the property of the Papal Chapel, written down from memory by Mozart at the age of fourteen, during his visit to Rome in 1770.