Jewish pirates were those seafaring Jewish people who engaged in piracy. While there is some mention of the phenomenon in antiquity, especially during the Hasmonean period, most Jewish pirates were Sephardim who operated in the years following the Alhambra Decree ordering the expulsion of Iberia's Jews. Upon fleeing Spain and Portugal, some of these Jews became pirates and turned to attacking the Catholic Empire's shipping as both Barbary corsairs from their refuge in the Ottoman dominions, as well as privateers bearing letters of marque from Spanish rivals such as the United Netherlands.