Question: Which British princess who gained title by second marriage was a member of the British Royal Family ?

text: British princess
List of princesses by marriage since 1714
Unless specified title held from marriage to death or present day Title of Princess where spouses title was eliminated by Letters Patent issued 30 November 1917 or Order in Council in 1919
This is a list of those who have held the title Princess of the United Kingdom from the accession of George I in 1714. This article deals with both princesses of the blood royal and women who become princesses upon marriage. The use of the title of Princess of the United Kingdom of Great Britain and Northern Ireland is entirely at the will of the sovereign as expressed in letters patent. Individuals holding the title of princess are styled Her Royal Highness (HRH). On 18 April 1917, the newest granddaughter of Wilhelm II, German Emperor was styled a British Princess from birth even though Germany and Britain were fighting in WWI. George V wrote Letters Patent on 30 November 1917, to restrict the automatic assignment of the title Princess and the use of the style Royal Highness to the following persons:
Princess Birth Death Marriage Husband Comments
Princess Caroline of Brandenburg-Ansbach 1683 1737 1705 George , Prince of Wales Gained title by accession of her father-in-law as George I in 1714 and held it until her husband 's accession as George II in 1727
Princess Augusta of Saxe-Gotha 1719 1772 1736 Frederick , Prince of Wales
Maria Walpole 1736 1807 1766 Prince William Henry , Duke of Gloucester and Edinburgh
Anne Horton 1742 1808 1771 Prince Henry , Duke of Cumberland and Strathearn Gained title by her second marriage
Princess Frederica Charlotte of Prussia 1767 1820 1791 Prince Frederick , Duke of York and Albany
Duchess Caroline of Brunswick-Wolfenbüttel 1768 1821 1795 George , Prince of Wales Held title until her husband 's accession as George IV in 1820
Duchess Frederica of Mecklenburg-Strelitz 1778 1841 1815 Prince Ernest Augustus , Duke of Cumberland and Teviotdale Gained title by her third marriage and held title until her husband 's accession as King Ernest Augustus of Hanover in 1837
Princess Augusta of Hesse-Kassel 1797 1889 1818 Prince Adolphus , Duke of Cambridge
Princess Victoria of Saxe-Coburg-Saalfeld 1786 1861 1818 Prince Edward , Duke of Kent and Strathearn Gained title by her second marriage
Princess Adelaide of Saxe-Meiningen 1792 1849 1818 Prince William , Duke of Clarence and St Andrews Held title until her husband 's accession as William IV in 1830
Princess Marie of Saxe-Altenburg 1818 1907 1843 George , Crown Prince of Hanover Held title until her husband 's accession as George V of Hanover in 1851
Princess Alexandra of Denmark 1844 1925 1863 Albert Edward , Prince of Wales Held title until her husband 's accession as Edward VII in 1901
Grand Duchess Maria Alexandrovna of Russia 1853 1920 1874 Prince Alfred , Duke of Edinburgh Held title until her husband 's accession as Duke of Saxe-Coburg and Gotha in 1893
Princess Thyra of Denmark 1853 1933 1878 Ernest Augustus , Crown Prince of Hanover Husband lost British title of Prince in 1917
Princess Louise Margaret of Prussia 1860 1917 1879 Prince Arthur , Duke of Connaught and Strathearn
Princess Helena of Waldeck and Pyrmont 1861 1922 1882 Prince Leopold , Duke of Albany
Princess Mary of Teck 1867 1953 1893 Prince George , Duke of York Held title until her husband 's accession as George V in 1910
Princess Victoria Adelaide of Schleswig-Holstein 1885 1970 1905 Prince Charles Edward , Duke of Albany Husband lost British title of Prince in 1919
Princess Viktoria Luise of Prussia 1892 1980 1913 Ernest Augustus , Duke of Brunswick Husband lost British title of Prince in 1917 . Princess Viktoria Luise was born Princess of Prussia being the only daughter of the German Kaiser Wilhelm II
Lady Elizabeth Bowes-Lyon 1900 2002 1923 Prince Albert , Duke of York Held title until her husband 's accession as George VI in 1936