is a great-great-great-great grandson of Prince Adolphus, Duke of Cambridge, 10th child and seventh son of King George III and Queen Charlotte.
On May 7 1818 at Kassel he married Princess Augusta of Hesse (1797-1889), the third daughter of Prince Friedrich of Cassel. A second ceremony at Buckingham Palace took place on June 1, 1818.
The Duke and Duchess of Cambridge had three children. The first child, a son, George, was born in March 1819. Princess Augusta was born three years later in July 1822, and the youngest child, Mary Adelaide, was born in November 1833.
The Duke of Cambridge died on July 8, 1850 at Cambridge House in London. He was succeeded by his only son, George, as the 2nd Duke of Cambridge. The new duke, who believed that "arranged marriages were doomed to failure," married for love. But his marriage in January 1847 to an actress Sarah Fairbrother was in contravention of the Royal Marriages Act, and, thus, did not exist in British law. The bride was pregnant at the time of the marriage. She was not entitled to the style of royal highness or the title of Duchess of Cambridge. Although Sarah was devoted to her husband, and bore him three sons, who had the surname FitzGeorge, the Duke of Cambridge also had several mistresses, including Mrs. Louisa Beauclerk. The Duke died on March 17, 1904, and with his death, his titles, Duke of Cambridge, Earl of Tipperary and Baron Culloden, became extinct.
It was not until July 14, 1917 that Cambridge was recreated as a Marquessate for Prince Adolphus, Duke of Teck, eldest son of HRH Mary Adelaide of Cambridge and her late husband, Prince Franz, Duke of Teck. Adolphus, known as Dolly, who was married to Lady Margaret Grosvenor, daughter of the 1st Duke of Westminster, renounced his German titles, and was created Marquess of Cambridge, Earl of Eltham, and Viscount Northallerton. His elder son, George, the Earl of Eltham, succeeded as the 2nd Marquess of Cambridge in 1927.
In 1923, George married Dorothy Hastings, a granddaughter of the 13th Earl of Huntington. They had only daughter, Lady Mary Cambridge. When the 2nd Marquess died in 1981, his titles became extinct as he had no male heirs. His younger brother, Lord Frederick Cambridge, had died while on active service in 1941.
The ties to the present Duke and Prince Adolphus, Duke of Cambridge come through a maternal line. Princess Mary Adelaide, daughter of the first duke, and sister of the 2nd and last Duke, was the mother of three sons, the aforementioned Dolly, Francis and Alexander and one daughter, Mary.
Princess Mary of Teck was first engaged to Prince Albert Victor, Duke of Clarence, third in line to the British throne. The Duke of Clarence, after attending the funeral of Prince Victor of Hohenlohe-Langenburg, caught cold, which developed into influenza, and then pneumonia. He died in January 1892. A year later, Princess Mary of Teck married his younger brother, Prince George, Duke of York, the future George V.
And now the dukedom has been recreated for Princess Mary Adelaide's great-great-great grandson, Prince William. This seems the right to do, as Princess Mary Adelaide, Queen Victoria's first cousin, who was known as the Peoples' Princess.