(1841-1910) the king of Great Britain and Ireland from 1901 to 1910, the son of Queen Victoria and Prince Albert. He was the Prince of Wales for most of his life, while his mother ruled. Victoria did not let him play much part in state affairs, so he spent most of his time at social events, such as parties, horse racing, etc. When she died in 1901, he became a popular king. His reign (= period as king) was a period of peace and economic success before World War I.