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ambitious designs of Castruccio were each day ripening. The whole Ghibeline force in Italy was now turned to the siege of Genoa, which was defended by Robert, king of Naples, at the head of the Guelphs. Castruccio had never actually joined the besieging army. But he had taken advantage of the war, which prevented the Genoese from defending their castles on the sea-coast, to surprise many of them, and to spread his conquests far beyond the Lucchese territory; and he was ever attentive to the slightest incident that might contribute to the exaltation of the