|Duke Robert Crumplebottom of Yorick|
|By right of birth, the Duke of Yorick, Earl of Mace, and Earl of Dunbar|
|Issue|| Elmira Clamp - Anna Arneson
Duke Robert Crumplebottom of Yorick (1908-1976) was the son of Duke Simon and Duchess Prudence. He would later marry Lady Victoria of Coburg-Gotha and have two children with her.
Lord Robert Cornelius Adolphus Crumplebottom was born as the second child and only son of the Earl and Countess of Mace. As a child, he did not excel in his studies and would often ignore the demands of his tutors.
After the death of Princess Lolita in 1926, the original betrothal between Princess Frida and Lord Robert was cancelled. Duke Simon searched for a possible replacement bride-to-be for his son; that replacement came in the form of Lady Victoria Coburg-Gotha. The couple were wed in the summer of 1928.
Robert died from complications of pneumonia in 1976.
- His Grace Lord Robert Crumplebottom of Mace (1908-1911)
- His Grace Lord Robert Crumplebottom of Yorick (1911-1928)
- His Grace Lord Robert Crumplebttom, 2nd Earl of Mace (1928-1941)
- His Grace Lord Robert Crumplebottom, 3rd Duke of Yorick (1941-1976)
|Lady Elmira Clamp||1931||2006||Married Sir Todd Clamp. No issue.|
|Lady Anna Arneson||1934||1960||Married Lord Arthur Arneson. Had issue|