Infanta D.Beatriz of Portugal died in 1506, 36 years after her husband D.Fernando Duke of Viseu
Her daughter Queen D.Leonor died in 1525, 30 years after her husband King D.João II.
Her sister D.Beatriz died in 1521, 38 years after her husband D.Fernando II Duke of Bragança.
Infanta Maria Francisca Benedita Princess of Brazil, died in 1829, 41 years after her husband and nephew Prince D. José.
Amelia de Beauharnais died in 1873, 38,5 years after her husband Emperor D.Pedro I of Brazil
Queen D.Amélia died in 1951, 43 years after the regicide of 1908 where her husband D.Carlos was assassinated.
Anita Stewart Duchess of Viseu died in 1977, 54 years after her husband D.Miguel de Bragança, duke of Viseu.
Infanta D.Maria Teresa of Bragança died in 1944, 48 years after ADke Karl-Ludwig of Austria.
Her sister D.Maria José died in 1943, 34 years after her husband Duke Karl Theodore.
Her sister D.Aldegundes died in 1946, 41 years after her husband Enrico de B.Parma.
Her sister D.Maria Ana died in 1942, 30 years after her husband Duke Guillaume of Luxembourg.
That Princess Emma of Waldeck and Pyrmont was widowed early was no surprise, since she married (as his second wife) King Willem III of the Netherlands, who was more than 40 years her senior. The same could be said of her sister Helen, who married Prince Leopold of the United Kingdom, Duke of Albany -- the hemophilic youngest son of Queen Victoria. Although both widows were young enough to catch new husbands, neither remarried. As such, they had long widowhoods (44 and 38 years, respectively).
Emma's Spanish counterpart, who was born Archduchess Maria Christina of Austria and became the second queen consort of King Alfonso XII, was also widowed early and found herself serving as regent for a minor sovereign. Her widowhood also lasted 44 years.
Other notable examples of long widowhoods are those of Great Britain's Queen Victoria (39 years) and Queen Elizabeth, the Queen Mother (50 years); Infanta Antonia of Portugal (52 years), second wife of Duke Roberto of Parma; Princess Zita of Bourbon-Parma (67 years), the last empress of Austria; and Princess Adelaide of Löwenstein-Wertheim-Rosenberg (43 years), wife of Dom Miguel of Portugal.
Can anybody name additional examples of notable royal women in the last 200 years, who were longtime widows (at least 30 years)?