Chance came to the aid of Justinian and helped him solve the highly significant problem of the Empire's silk trade. Some person or persons successfully evaded the watchfulness of the Chinese inspectors and smuggled into the Byzantine Empire some silkworm eggs from Serinda, which formed the basis of a new industry for the Greeks. They made rapid progress. Large plantations of mulberry trees sprang up and many factories for weaving silk stuffs were quickly established. The most important of these silk factories were situated in Constantinople; others were founded in the Syrian cities of Beirut, Tyre, and Antioch, and later in Greece, mainly at Thebes. One existed in Alexandria in Egypt, for Egyptian clothes were sold in Constantinople. The silk industry became a state monopoly and yielded the government a large income, which was not sufficient, however, to ameliorate the critical financial situation of the empire. Byzantine silk stuffs were carried to all parts of western Europe and adorned the palaces of western kings and the residences of rich merchants. This caused some highly significant changes in the commerce of Justinian's period, and his successor, Justin II, could show to a Turkish ambassador visiting his court the industry in full swing.