Final answer:
Alexander I did not help the Greeks in their War of Liberation against the Turks; the Greek prince named Alexander Ypsilantis was associated with the early stages of the Greek War of Independence.
Step-by-step explanation:
Alexander I did not involve himself in the Greek War of Liberation against the Turks directly. The struggle referred to in the question occurred during the Greek War of Independence, which began in 1821. This was a national revolution of the Greek people against Ottoman rule, aiming to establish an independent Greek state. Alexander I's name is sometimes confused with that of Alexander Ypsilantis, a Greek prince and a leader in the early stages of the war. European sentiment heavily favored the Greeks due to their historical significance as the cradle of European culture, prompting many Europeans to support the Greek cause, although Alexander I of Russia did not provide direct military aid.