Frederica Susanna Schomberg Mildmay, Countess FitzWalter, 3rd Countess of Mértola (Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

, 1687 – 7 August 1751) was a British

Kingdom of Great Britain

The former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...

 peeress

Peerage

The Peerage is a legal system of largely hereditary titles in the United Kingdom, which constitute the ranks of British nobility and is part of the British honours system...

.

Frederica was the eldest surviving daughter of Meinhardt Schomberg, 3rd Duke of Schomberg

Meinhardt Schomberg, 3rd Duke of Schomberg

Meinhardt Schomberg, 3rd Duke of Schomberg, 1st Duke of Leinster, KG was a general in the service of Prince William of Orange, later King William III of England.-Military career:...

 and his second wife, Karoline, a daughter of Charles I Louis, Elector Palatine

Charles I Louis, Elector Palatine

Charles Louis, , Elector Palatine KG was the second son of Frederick V of the Palatinate, the "Winter King" of Bohemia, and his wife, Princess Elizabeth, daughter of King James I of England ....

. On 26 May 1715, she married the 3rd Earl of Holderness

Robert Darcy, 3rd Earl of Holderness

Robert Darcy, 3rd Earl of Holderness, PC was a British peer and politician.Darcy was the second son of John Darcy, Lord Conyers, himself the eldest son of Conyers Darcy, 2nd Earl of Holderness. He was styled Lord Conyers when his father died in 1688 and later inherited his grandfather's earldom...

 and they had two surviving children: Hon. Robert

Robert Darcy, 4th Earl of Holderness

Robert Darcy, 4th Earl of Holderness PC , known before 1721 as Lord Darcy and Conyers, was a British diplomat and politician. From 1744 to 1746 he was ambassador at Venice and from 1749 to 1751 he represented his country at The Hague...

 (1718-1778) and Lady Caroline (d. 1778, married the 4th Marquess of Lothian

William Kerr, 4th Marquess of Lothian

General William Henry Kerr, 4th Marquess of Lothian KT was a Scottish nobleman, soldier and politician, the eldest son of William Kerr, 3rd Marquess of Lothian. He was styled Master of Jedburgh until 1722, Lord Jedburgh from 1722 to 1735, and Earl of Ancram from 1735 to 1767...

).

On the death of the countess' father in 1719, she inherited his Portuguese

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

 countship of Mértola

Count of Mértola

The title Count of Mértola was granted to General Schomberg by Afonso VI of Portugal, in 1663, as a reward for Schomberg's services with the Portuguese army...

 as his eldest surviving child. Her husband died in 1721 and on 18 June 1724, she married Hon. Benjamin Mildmay

Benjamin Mildmay, 1st Earl FitzWalter

Benjamin Mildmay, 1st Earl FitzWalter PC , styled The Honourable Benjamin Mildmay until 1728 and known as The Lord FitzWalter between 1728 and 1730, was a British politician...

, who was later created Earl FitzWalter in 1730.

Via cognatic primogeniture, she was the most senior descendant of James I of England

James I of England

James VI and I was King of Scots as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the English and Scottish crowns on 24 March 1603...

 to be Protestant, but she was passed over for Sophia of Hanover

Sophia of Hanover

Sophia of the Palatinate was an heiress to the crowns of England and Ireland and later the crown of Great Britain. She was declared heiress presumptive by the Act of Settlement 1701...

. Her cognatic heir is Diana Miller, Countess of Mértola.