But the castle 's transformation occurred after its purchase in 1925 by William Randolph Hearst , the American newspaper tycoon .
More enlightened improvements were made by its subsequent owner , the coal magnate Morgan Stuart Williams .
The castle 's transformation occurred after its purchase in 1925 by William Randolph Hearst , the American newspaper tycoon .
More enlightened improvements were made by its subsequent owner , the coal magnate Morgan Stuart Williams .