[2]Nonetheless, her noble ancestors in the United Kingdom did not suffice to permit Laura to contract an equal marriage with a cadet of a German mediatised family of princely rank in 19th century Europe.

Almost two weeks before her morganatic marriage to Prince Victor of Hohenlohe-Langenburg (a half-nephew of Queen Victoria who had served under her father's military command) on 26 January 1861, she was created Countess von Gleichen by Ernst II, Duke of Saxe-Coburg and Gotha.

Henceforth she was known as HSH Princess Victor of Hohenlohe-Langenburg, although this changed neither her legal rank nor her title in the German Empire.

Laura Seymour and Prince Victor had four children, the daughters becoming notable for their artistic endeavors and cultural patronage:

[3] Paternally, she descended in unbroken male line from the Seymours (originally, St. Maur) who belonged to the gentry of the 12th century, acquired considerable landed wealth by the marriage of Sir Roger de St. Maur to the baronial co-heiress Cecily Berkeley, and were raised to peerage in 1536 as Viscounts Beauchamp.