Herbert was born 19 September 1791 at Hill Street, London, the second son of the 11th Earl of Pembroke by his first marriage to his first cousin, Elizabeth. She was the daughter of Topham Beauclerk by Lady Diana Beauclerk, dau. of Charles Spencer, 3rd Duke of Marlborough, and great-great-granddaughter of Charles II. He spent his childhood at Wilton House, the Pembroke country seat in Wiltshire. After education at Harrow School, he matriculated at Christ Church, Oxford in 1810. He later travelled to Sicily. Against his father's wishes, Herbert made a disastrous clandestine marriage at the Butera Palace in Palermo on 17 August 1814. His bride was a Sicilian princess, Ottavia Spinelli, the recently widowed wife of the Prince Ercole Branciforte di Butera, and daughter of the Duke of Laurino. Before the death of the Prince, the young Viscount Herbert had been the Princess's cavaliere servente. His father attempted to have the marriage dissolved without success, but succeeded in persuading the Sicilian authorities to separate the parties. Accordingly, Lord Herbert was imprisoned in a fortress and his wife in a convent. Herbert managed to escape, however, to Genoa and returned to England, where his father persuaded him to abandon the Princess. She promptly took a house in London under the name of Lady Herbert and brought a suit for restitution of conjugal rights in the English courts in 1819. The marriage was annulled and she was awarded £800 p.a., which it is said was later increased to £5,000, but Lord Herbert and the Princess never came together again. Neither did either ever remarry.
Exile
Herbert succeeded to the titles on the death of his father in 1827 and took his seat in the House of Lords in 1833. Under a family agreement, his diligent younger half brother, the statesman Sidney Herbert, 1st Baron Herbert of Lea, took control of managing the family estates centred on Wilton House, Wiltshire. Subsequently by 1837 Herbert was living in Paris, where Lord Malmesbury wrote of him, "Lord Pembroke lives in great state in Paris, and is as famous for his cook as for his horses. He is a very handsome man." Herbert owned Lancret's "Dance before a Fountain", previously in the collection of Catherine the Great; it became part of his later estate sale in June 1862. A second painting in his collection was Jean-Baptiste Pater's Réunion dans le pare. He also owned a Garde Temps 18K gold pocket watch purchased in 1832 from Louis Antoine Breguet for 5,000 francs. He lived out his exile at No. 19 Place Vendôme, during which time he sired some seven illegitimate children, most of whom adopted the surname 'Montgomery' or ‘de Pembroke de Montgomery’. His frequent trips to London resulted in children by Alexina Sophia Gallot, dau. of John and Ann Gallot:
Robert Henry Granville Montgomery, born circa 1840.
Sidney George Granville Montgomery, born circa 1842, ? m. Catherine, dau of Edward Heugh, and had issue.
Ida Alexina, b. 1846.
In Paris, he formed a relationship with ballet dancer Marie Catherine Caroline Schäffer, who bore him:
Henriette, b. Paris 30 November 1844; m. 1866 Amédée, baron Dubreton, and d. 1910.
Henri Georges de Pembroke de Montgomery, diplomat, born 17 December 1845; m. Feb 1884 Marie Lucille Adèle Ditte; and d. 29 November 1900.
Adolphus, b. 1848.
Henriètte Jeanne Montgomery, born 2 November 1855; m. 5 May 1877 Louis Janvier de la Motte; and d. 16 July 1904.
He died in Paris 25 April 1862, where he is buried in the Père Lachaise Cemetery. Herbert provided generously for all his children in his will.
Succession
Herbert was succeeded in his titles by his half nephew, George Robert Charles Herbert, 13th Earl of Pembroke, who had the previous year succeeded to the barony of Herbert of Lea, so that that title merged with the earldom. The 13th Earl's siblings were granted the style and precedence of the younger sons or daughters of an Earl by Royal Warrant.
