Halifax is a city. Located in West Yorkshire, England, it was granted city status on 25 August 1937 by King George VI to mark his coronation (following the abdication of Edward VIII—not Edward VII, who abdicated in 1936; George VI was his brother).
Halifax remains a city today, part of the Metropolitan Borough of Calderdale. Population ~90,000 (town), ~210,000 (borough). It is known for its Victorian architecture, Piece Hall (historic cloth market), Dean Clough mills, and as the birthplace of the Halifax Building Society (now part of Lloyds Banking Group).
Correction to source: King Edward VII died in 1910. The 1936 abdication was Edward VIII. George VI (Edward VIII's brother) was crowned in 1937.