Read the following paragraph and extract the answer for the question: What is the real name of the person who it was said to be a dangerous opponent if threatened with frustration?

Wheeler was known as "Rik" among friends. He divided opinion among those who knew him, with some loving and others despising him, and during his lifetime, he was often criticised on both scholarly and moral grounds. The archaeologist Max Mallowan asserted that he "was a delightful, light-hearted and amusing companion, but those close to him knew that he could be a dangerous opponent if threatened with frustration".
His charm offensives were often condemned as being insincere. During excavations, he was known as an authoritarian leader but favoured those who he thought exhibited bravery by standing up to his authority. Hence, he has been termed "a benevolent dictator". He was meticulous in his writings, and would repeatedly revise and rewrite both pieces for publication and personal letters. Throughout his life, he was a heavy smoker.Wheeler expressed the view that he was "the least political of mortals". Despite not taking a strong interest in politics, Wheeler was described by his biographer as "a natural conservative"; for instance, during his youth he was strongly critical of the Suffragettes and their cause of greater legal rights for women. Nevertheless, he was "usually happy to advance young women professionally", something that may have been based largely on his sexual attraction toward them. He expressed little interest in his relatives; in later life, he saw no reason to have a social relationship with people purely on the basis of family ties.Wheeler was married three times. In May 1914, Wheeler married Tessa Verney. Tessa became an accomplished archaeologist, and they collaborated until she died in 1936. Their only child, Michael Mortimer Wheeler, was born in January 1915; he became a barrister. Following Tessa's death, in 1939, Wheeler married Mavis de Vere Cole, widow of the prankster Horace de Vere Cole. Their relationship was strained; Cole's diaries revealed that Wheeler physically hit her when she annoyed him. In 1945 Mortimer Wheeler married his third wife, Margaret "Kim" Collingridge....
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