Wallace Collection of the wealthiest families in Europe. They owned large properties in England, Wales and Ireland, and increased their wealth through successful marriages. Politically of lesser importance, the 3rd and 4th Marquess and Sir Richard Wallace became leading art collectors of their time. The Wallace Collection, comprising about 5,500 works of art, was bequeathed to the British nation by Lady Wallace in 1897. The state then decided to buy Hertford House to display the collection and it was opened as a museum in 1900. As a museum the Wallace Collection's main strength is perhaps its extraordinary array of 18th-century French art:
Marquess of Northampton its Royal Charter. Lord Northampton married Margaret Douglas-Maclean-Clephane, daughter of Major-General Douglas Maclean Clephane. He was succeeded by his eldest son, the third Marquess. In 1831 he assumed by Royal licence the additional and principal surname of Douglas. When he died the titles were inherited by his younger brother, the fourth Marquess. He was an admiral in the Royal Navy. Lord Northampton assumed in 1851 by Royal licence the additional surname of Maclean and in 1878 upon succeeding to the titles that of Douglas. He was succeeded by his second but eldest surviving son, the fifth Marquess. He represented Stratford-on-Avon