Major-General Sir Henry Mill Pellatt, was a Canadian financier and soldier. He is notable for his role in bringing hydro-electricity to Toronto for the first time, and also for his large château in Toronto, called Casa Loma, which was the biggest private residence ever constructed in Canada. Casa Loma would eventually become a well-known landmark of the city. His summer home and farm in King City later became Marylake Augustinian Monastery.

Casa Loma is a Gothic Revival castle-style mansion and garden in midtown Toronto, Ontario, Canada, that is now a historic house museum and landmark. It was constructed from 1911 to 1914 as a residence for financier Sir Henry Pellatt. The architect was E. J. Lennox, who designed several other city landmarks. Casa Loma sits at an elevation of 140 metres (460 ft) above sea level, 66 metres (217 ft) above Lake Ontario.