Catherine (Williamson) Marbury (abt. 1494 - 1525)

In the Familysearch.com page for Katherine (https://www.familysearch.org/tree/person/details/LKTM-HC5), in the Life Stories section, there are compelling arguments that Katherine's father was one John Williamson, who died in 1512-13, and that this Katherine was his heiress as well as Robert Marbury's wife. Excerpts of their death inquisitions are quoted. (Note that I don't have access to these inquisitions - this would be a project for a qualified genealogist.) John as father is consistent with one part of Charles Vigneron's comment above. However, John's wife was probably not Jane Angevin (or Angerine), as Jane supposedly died in 1522 (unsourced conventional wisdom.)

Robert I King of France, d. 923, m. Aelis


• Adela of France m. Herbert II Count of Vermandois; son of Herbert I Count of Vermandois; son of Pepin Lord of Peronne and St. Quentin, Count near Paris; son of Bernard King of Italy, d. 818; son of Pepin King of Italy; son of Charlemagne, d. 814, 
m. Hildegardis of Kraichgau

• Robert Count of Meaux & Troyes m. Adelaide of Burgundy

• Adela de Vermandois m. Geoffrey Count of Anjou

• Ermengarde of Anjou m. Conan I Duke of Brittany
• Duchess Judith of Brittany m. Richard II Duke of Normandy

• Robert I Duke of Normandy, by Herleve, his mistress

• Duchess Adelaide of Normandy m. 2) Lambert II Count of Lens

• Countess Judith of Lens m. Waltheof Earl of Huntingdon
• Countess Maud of Huntingdon m. 1) Sir Simon St Liz
• Lady Maud St Liz m. 2) Saher I de Quincy
• Alice St Liz m. Sir Roger FitzWilliam
• Sir William de Huntingfield, Surety m. Isabel FitzRoger ‡ Sir Richard de Clare, Surety m. Amice of Gloucester (descent of King Henry I of England)
• Alice de Huntingfield m. Hugh le Rus ‡ Maud de Clare m. Sir William de Brewes
• Sir William le Rus m. Agatha de Clare ‡ Sir John de Brewes m. Margaret verch Llywelyn
• Alice le Rus m. Sir Richard de Brewes
• Sir Giles de Brewes m. Joan de Beaumont
• Sir John de Brewes m. Eva de Ufford
• Sir John de Brewes m. 1) Joan de Shardelow
• Margaret de Brewes m. Sir Thomas Hawley ‡ Sir Walter Blount m. Doña Sancha de Ayala
• Agnes Hawley m. 2) Patrick Skipwith Esq., MP ‡ John Hawley m. Agnes ‡ Sir Thomas Blount m. Margaret Gresley
• Margaret Skipwith m. Bernard Angevine ‡ Agnes Hawley m. 2) Sir Thomas Blount
• Michael Angevine m. Joan Towthby ‡ Ann Blount m. William Marbury, Esq.
• Jane Angevine m. 1) John Williamson, father of Katherine ‡ Robert Marbury, Esq. m. Katherine Williamson, his 2nd cousin

Sources: Douglas Richardson 'Magna Carta Ancestry' & 'Royal Ancestry' TAG Vol. 91 No. 3; TAG Vol. 91 No. 4

Please change her maiden name to Unknown. Her parents have not been identified in official sources. Thank you.