Courtesy dukes

Charles Stuart, Duke of Kendal (4 July 1666 – 22 May 1667) was the third son of James, Duke of York (later James II of England) and his first wife Anne Hyde.
Charles was born on 4 July 1666 at St James's Palace. His godparents were his three-year-old brother James, Duke of Cambridge, his cousin James, Duke of Monmouth, and Emilia von Nassau, Countess of Ossory. He was designated Duke of Kendal and was to have been created Duke of Kendal, Earl of Wigmore, and Baron of Holdenby, but no patent was ever enrolled. He died at St James's Palace at the age of 10 months on 22 May 1667 and was buried in Westminster Abbey on 30 May 1667.

Monsieur d'Orléans (16 April 1607 – 17 November 1611) was the second son and fourth child of Henry IV of France and his consort, Marie de' Medici. Commonly ascribed the names Nicolas or Nicolas Henri and the title Duke of Orléans, he was neither baptised nor invested as such during the course of his short life.
He was betrothed to Marie de Bourbon-Montpensier, heiress to vast lands of the extended House of Bourbon. After his father's death in 1610, he was heir presumptive to his older brother, Louis XIII. Of frail health, he died of seizures brought on by hydrocephalus at the age of four, whereupon his title and betrothal were transferred to Gaston, his younger brother.