By marriage. The wife of a British prince becomes a British princess, but she cannot use the princess title before her own given name. She can use the princess title with her husband's given name (e.g. Princess Michael of Kent), while the wife of the Prince of Wales is styled as the Princess of Wales (e.g. Catherine, Princess of Wales).
Prince Heinrich of Hanover (born 1961), married Thyra von Westernhagen and had issue (including a son, Albert). Princess Ortrud died in 1980. Ernest Augustus married again in 1981, Countess Monika zu Solms-Laubach (1929–2015), daughter of Georg, 9th Count of Solms-Laubach, and Johanna, Princess of Solms-Hohensolms-Lich.
Ernest Augustus (German: Ernst August; 5 June 1771 – 18 November 1851) was King of Hanover from 20 June 1837 until his death in 1851. As the fifth son of King George III of the United Kingdom and Hanover, he initially seemed unlikely to become a monarch, but none of his elder brothers had a legitimate son.
Princess Maria Maximilianovna of Leuchtenberg: 2. Berthold, Margrave of Baden: 10. Ernest Augustus, Crown Prince of Hanover: 5. Princess Marie Louise of Hanover: 11. Princess Thyra of Denmark: 1. Princess Margarita of Baden: 12. George I of Greece: 6. Prince Andrew of Greece and Denmark: 13. Grand Duchess Olga Constantinovna of Russia: 3.
Princess Marianne of the Netherlands: 12. Prince Augustus William of Prussia (= 10) 6. Frederick William II of Prussia: 13. Duchess Luise of Brunswick-Wolfenbüttel (= 11) 3. Princess Wilhelmine of Prussia: 14. Louis IX, Landgrave of Hesse-Darmstadt: 7. Princess Frederica Louisa of Hesse-Darmstadt: 15. Countess Palatine Caroline of Zweibrücken
In 1980, Princess Marie-Auguste legally adopted the businessman Hans Lichtenberg, who subsequently took the name Frédéric Prinz von Anhalt. According to Prinz von Anhalt, who thereafter proceeded to sell knighthoods and marriages related to his new station, he gave her $4,000 a month (German sources say 2000 Deutsche Mark a month) in financial support.
Princess of Prussia 5 May 1713-10 June 1714 Died in infancy Frederica Louise Margravine of Brandenburg-Ansbach 28 September 1714-4 February 1784 Married Charles William Frederick, Margrave of Brandenburg-Ansbach and had issue Philippine Charlotte Duchess of Brunswick-Wolfenbüttel 13 March 1716-17 February 1801