Eu Tong Sen was a well-known tycoon in the late 19th and early 20th centuries with business interests across Southeast Asia. He was also vice-president of the Anti-Opium Society and a somewhat eccentric property owner. Heir to his family’s retail and mining businesses, he took control of his father’s estate in 1898. Over the decades that followed, he multiplied his fortune several times over. By age 30, he was one of the region’s richest men, specialising in the tin mining and rubber industries.