nominee of his own who was already a bishop, and therefore ineligible, and by virtue of the Concordat he decided for his own candidate in defiance of all ecclesiastical laws, and straightway invested him with the regalia. [Sidenote: Imperial rights.] Moreover, he had a high idea of the imperial mission. It was seventeen years since any emperor had crossed the Alps; and it is difficult to say whether the selfish policy of Lothair or the non-appearance of Conrad must have been the more detrimental to the maintenance of imperial interests. But during the first few months of his reign appeals poured in from the Pope against his various enemies, from some barons of Apulia against the great Roger of Sicily, from the citizens of Lodi against the tyranny of Milan. These, together with the ridiculous proffer of the imperial crown from the lately formed Republic of Rome, seemed to open an opportunity for the successful recovery of imperial rights. And, much as the Italians resented the spasmodic interferences of the Emperor, they were proud of their imperial connection. The commerce of the East, largely increased by the Crusades, flowed into Western Europe chiefly through Italy. As a result, the north and centre of the peninsula were studded with a number of compact, self-governing communities inclined to resent any outside interference, however lawful in origin. But the larger cities were ever trying to group the smaller round them as satellites; and the constant quarrels which resulted, often produced a party which was ready to welcome the interposition of the Emperor. There was this common ground, then, between these cities and the Papacy that, whereas they found it equally necessary to invoke the aid of the Emperor as an outside power against their foes, each was threatened by the assertion of those imperial rights which it was the sole object of Frederick's journey to Italy to assert. But the results of Frederick's first expedition to Italy were of a very doubtful kind. It is true that he was crowned at Rome, that he asserted his imperial rights both positively in a great assembly on the plains of Roncaglia and, as it were, negatively by the destruction of three refractory towns, and that he got rid of Arnold of Brescia. But, on the other hand, his assertion of power provoked hatred instead of fear; and although, despite some sharp differences, he parted amicably from the Pope, his return to Germany left Hadrian in an impossible position. The republican party in Rome remained untouched: William of Sicily was unsubdued. [Sidenote: Papal defiance.]