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Don William Adrian Dias Bandaranaike (Sinhala: දොන් විලියම් ඒඩ්‍රියන් ඩයස් බණ්ඩාරනායක) Muhandiram of the Governor's Gate, was a Ceylonese colonial-era headmen and interpreter for the British during the capture of King Sri Vikrama Rajasinha of Kandy in 1815.

Family History
The origins of the Bandaranayaka family in Sri Lanka is claimed to be from the person known as Nilaperumal Pandaram who was from India and served he was high priest of the Temple of Nawagamuwa Pattini Devalaya. The family changed their name to the Sinhalese form of Bandaranaike and they adopt Portuguese name like Dias. They served the Portuguese rule and got social privileges and later on Dutch. Their golden era began as translators and local scribes expanding their influence and power.