with the new Emperor, was married in 1346 at the ripe age of sixty-two to the young Theodora, who was to be allowed to remain a Christian. It may be assumed that the six thousand soldiers lent to Cantacuzene returned to Asia. But the loan of them soon became a precedent for other transactions of the same kind. In 1349 the Serbians, under Stephen Dushan, were seriously threatening Salonika, and had ultimate designs on Constantinople itself. Orchan was again appealed to for aid by the two Emperors, his father-in-law and brother-in-law, and at their instance he sent twenty thousand soldiers into Europe for the relief of Salonika. With their aid Cantacuzene was able to defeat the Serbians, and to extinguish for ever their hope of replacing the Byzantine Empire at Constantinople. On this occasion, again, it appears that the Ottoman troops, having effected their purpose, returned to Asia. But four years later another opportunity befell Orchan of sending troops across the Straits, and this time of effecting a permanent lodgment in Europe. Cantacuzene, not satisfied with being only a co-Emperor with his son-in-law and the Empress Anna, attempted, in 1353, to usurp the supreme power in the State. His son-in-law, John Palæologus, now of full age, strongly opposed this. Civil war again broke out. For a third time Cantacuzene appealed to his son-in-law Orchan for aid. In return for the loan of twenty thousand soldiers he offered to hand over to the Ottomans a fortress on the European side of the Hellespont. Orchan agreed to this. The Ottoman soldiers were sent into Europe, under Solyman, and were employed by Cantacuzene in fighting against his other son-in-law, the co-Emperor John. They were successful in this, and occupied Demotika. Meanwhile the insignificant fortress of Tzympe was handed over to Orchan and was occupied by Ottoman troops with the full consent of Cantacuzene.