Sir Walter Raleigh led two expeditions in search of which land?

Sir Walter Raleigh (born 1552 (or 1554) – 29 October 1618) was an English landed gentleman, writer, poet, soldier, politician, courtier, spy and explorer. He was cousin to Sir Richard Grenville and younger half-brother of Sir Humphrey Gilbert. He is also well known for popularising tobacco in England. Raleigh was one of the most notable figures of the Elizabethan era.

In 1594, Raleigh heard of a "City of Gold" in South America and sailed to find it, publishing an exaggerated account of his experiences in a book that contributed to the legend of "El Dorado". After Queen Elizabeth died in 1603, Raleigh was imprisoned in the Tower, this time for being involved in the Main Plot against King James I, who was not favourably disposed towards him.

In 1616, he was released to lead a second expedition in search of "El Dorado". During the expedition, men led by his top commander ransacked a Spanish outpost, in violation of both the terms of his pardon and the 1604 peace treaty with Spain. Raleigh returned to England and, to appease the Spanish, he was arrested and executed in 1618.