Task: Question Understanding
Input (English): Passage: The new Ottoman army arrived on the island during the winter of 1666/1667, and in May, the final phase of the siege, overseen by the Grand Vizier himself, began. It would last for 28 months and cost the lives of 70,000 Ottoman soldiers, 38,000 conscripted Cretans and slaves who labored in the Ottoman siege works and 29,088 of the city's Christian defenders. Faced with the renewed Ottoman assault and a struggling economy, despite the prospect of considerable reinforcements from Western Europe, in 1668 the Signoria hoped to end the war by striking a peace settlement with the Ottomans. Indeed, the Venetians hoped to use the imminent arrival of reinforcements to secure concessions from the Ottomans. Admiral Andrea Valier was at first appointed as envoy, but fell ill and was quickly replaced by the elderly nobleman Alvise da Molin. Molin and his embassy traveled to Larissa, where the Ottoman court resided during one of the Sultan's hunting expeditions. The Ottomans proposed that Venice keep one half of Crete, but the Signoria, emboldened by further pledges of reinforcements, especially from France, and renewed turmoil at the Ottoman court and within the Empire, refused the offer. Molin, in the meantime transported by the Ottomans to Canea in Crete, was ordered to continue negotiations and to continue observing the Ottomans' strength and intentions, but not commit himself or the Republic.
Question: What year did the final phase of the siege, overseen by the Grand Vizier begin?
Output (English): date