Belgium's Princess Mathilde, Duchess of Brabant (now Queen Mathilde) and her daughter Princess Eleonore visit the educational farm De Pierlapont in Loppem, July 8, 2010.
King Hassan II of Morocco and President Reagan riding during a horseback riding trip at Fairfield Farm in Winchester, Virginia, 19 May 1982.
Source: The Ronald Reagan Foundation and Presidential Library
King Carl Gustaf and Princess Madeleine riding in summer 2010.
Charlotte Casiraghi with a beautiful horse in 2010
Princess Haya is pictured with Joviality during Ascot 2012. The princess’s horse won the Windsor Forest Stakes.
Source: Thoroughbred News
F. The Netherlands
The then Crown Prince Willem-Alexander and Crown Princess Maxima riding horses in Ulan Bator, Mongolia, during an Official Visit. June 17, 2006
Source: ANP Foto
Princess Märtha Louise of Norway is pictures riding a horse for a photoshoot with Scanorama.
Source: Faximil frĺn Scanorama
Infanta Elena and her horse Qantas are pictured at the Global Masters tour in Valenci.
I. Great Britain
Queen Elizabeth II riding Burmese during the Trooping the Color. Burmese was given to the queen in 1969 by the Royal Canadian Mounted Police. The queen rode the mare during each Trooping of the Color for eighteen years. Upon Burmese's retirement in 1986, the queen stopped riding during the Trooping of the Color, instead using a carriage to travel to the event, and a dais to inspect the troops. Reportedly, riding Burmese during the Trooping of the Color was the only time the queen rode sidesaddle, usually preferring to ride astride.
Source: the official website of the British Monarchy, royal.gov.uk
The painting Napoleon Crossing the Alps
, by Jacques-Louis David, features a horse believed to be Marengo, Napoleon's famous war horse, ridden in numerous battles during the Napoleonic wars, including the Battle of Waterloo.
Source: Photo image: Public Domain, Original Painting: Jacques-Louis David, 1800.