The subject of this appendix is a series of episodes that have considerable bearing on the evolution of an Aragonese-Catalan imperium under Peter IV, within which the kingdom of Majorca had become an enclave blocking the chance to dominate the western Mediterranean. The aim of a western Mediterranean thalassocracy was the more urgent in view of the severe worsening of Catalan-Genoese relations during the early fourteenth century, largely as a result of the Catalan invasion of Sardinia, in which the Genoese possessed such important economic and political interests.

The ties between Mallorca and Sardinia are symbolised by the fact that the closest point between modern Spain and modern Italy is the stretch of water between Maó in eastern Menorca and Alghero or l'Alguer, the Catalan-speaking town in north-western Sardinia. It is thus no accident that it was precisely from Maó that the fleet of the Infant Alfonso left in 1323 for the conquest of Sardinia. However, rather little evidence survives for the relationship between the Majorcan kings and the many rulers of late-thirteenth- and early fourteenth-century Sardinia. The fundamental works of Salavert and Arribas that deal with Aragonese ambitions in Sardinia say little about Mallorca; Salavert does, however, stress the importance of the restoration of the Majorcan monarchy to its Balearic lands in the negotiations that led to the acquisition by James II of Aragon of his title to Sardinia and Corsica, between 1295 and 1298.