See the 25th and 30th dissertations of the Antiquitates Medii Aevi of Muratori. From Anderson's History of Commerce, I understand that the Venetians did not trade to England before the year 1323. The most flourishing state of their wealth and commerce, in the beginning of the 15th century, is agreeably described by the Abbe Dubos (Hist. de la Ligue de Cambray, tom. ii. p. 443-480).