"Ma'oz Tzur" (Hebrew: מָעוֹז צוּר, romanized: Māʾōz Ṣūr) is a Jewish liturgical poem or piyyut. It is written in Hebrew, and is sung on the holiday of Hanukkah, after lighting the festival lights. The hymn is named for its Hebrew incipit, which means "Strong Rock (of my Salvation)" and is a name or epithet for God in Judaism. It is thought to have been written sometime in the 13th century, although recent research suggests the 12th century. It was originally sung only at home, but has been used in the synagogue since the 19th century or earlier. In more recent years, of its six stanzas sometimes only the first stanza is sung (or the first and fifth). Source: Wikipedia (en)