A few days after his arrival, he also witnessed a naval battle in the Bay of Sorrento on St. John's Day, June 24, 1287, during the conflict of the Sicilian Vespers.
Poucos días despois da súa chegada, foi testemuña dunha batalla naval na baía de Sorrento o 24 de xuño de 1287, durante o conflito das Vésperas sicilianas.