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On the sign:
WIIIR ROTTEN ROW THE KINGS OLD ROAD COMPLETED 1690 THIS RIDE ORIGINALLY FORMED PART OF KING WILLIAM IIIS CARRIAGE DRIVE FROM WHITEHALL TO KENSINGTON PALACE, ITS CONSTRUCTION WAS SUPERVISED BY THE SURVEYOR OF THEIR MAJESTIES ROADS, CAPTAIN MICHAEL STUDHOLME, AND IT WAS THE FIRST LAMP-LIT ROAD IN THE KINGDOM. DESIGNATED AS A PUBLIC BRIDLEWAY IN THE 1730S, ROTTEN ROW IS ONE OF THE MOST FAMOUS URBAN RIDING GROUNDS IN THE WORLD. EIIR 1990
A road paved in the late 17th century by William III that to create a safe path between Kensington Palace and St. James Palace paved a road in Hyde Park.
WIIIR - William III Regina EIIR - Elizabeth II Regina