Joanna I of Naples
In 1353, he married Violante of Vilaragut, a daughter of Berengar de Vilaragut and widow of James III of Majorca. There were no children from this marriage. By 1372, Otto was a widower. On 25 September 1376, Otto married his second wife, the three times widowed Queen Joanna I of Naples. The groom was fifty-six years old and the bride about forty-eight. The marriage was childless.