Dukes and princes of Arenberg Dukes of Beaufort-Spontin Dukes and princes of Croÿ Princes of Habsburg-Lorraine (archducal cadets resident in Belgium) Princes of Lobkowicz (resident in Belgium) Dukes and princes of Looz-Corswarem Princes of Stolberg-Stolberg Prince of Waterloo Hungary Before 1947, the style His/Her Serene Highness (Őfőméltósága, literally: "His/Her High Dignity") was in use in Hungary. Peers with the title of prince were entitled to it, and between 1920 and 1944 the regent, Miklós Horthy, was styled as His Serene Highness the Regent of the Kingdom of Hungary (Őfőméltósága, a Magyar Királyság kormányzója). Portugal As the most powerful noble family in Portugal, the Dukes of Braganza had the official treatment of Serene Highness until 1640, when they mounted the Portuguese throne, thereby becoming entitled to the style of Royal Highness, however the infantes not in direct line for the throne of Portugal were titled as "His/Her Highness, the Serene Infante(a)". Mexico From 1853 to 1855 the president of Mexico, Antonio Lopez de Santa Anna, enjoyed the official style of Most Serene Highness, a treatment unique in that country. Agustin I de Mexico gave that title to several members of his family. Spain In 1807 Manuel de Godoy, Prince de la Paz, was accorded the style of Most Serene Highness, a treatment unique in that country at the time. Previous to this grant the style was sometimes used by the Catholic Monarch Isabella and Ferdinand as well as by other houses known anciently as illustrious or serene. A majority of these ancient houses lost the style through prescription. The honorific () is one of the styles of the infantes. Thailand In Thailand, the title of Serene Highness is the westernized style of the Thai title of Mom Chao (His/Her Serene Highness Prince/Princess | Thai: หม่อมเจ้า), denoting the grandchild of a king through one of his princely sons. In present-day Thailand, there are very few Mom Chao left after the royal family discontinued the traditional practice of polygamous marriages, and in Thailand all royal titles and styles decrease one level every generation for those not of the immediate royal family. Therefore, the child of a Mom Chao would only have the aristocratic title of Mom Rajawongse, which would then decrease in the next generation to Mom Luang, which would then decrease further, similar to a British life peerage. See also Style (manner of address) Most Serene Republic SAS (novel series), named after