Adam de Kellett1 
Child of Adam de Kellett and Matilda de Singleton
- Margaret de Kellett+1 b. 1201
Matilda de Singleton1 
Her married name became de Kellett.1
Child of Matilda de Singleton and Adam de Kellett
- Margaret de Kellett+1 b. 1201
Sir Robert de Holand1 
Child of Sir Robert de Holand and Cecily de Columbers
- Robert de Holand+1 b. 1220, d. 1275
Theobald Dillon, 3rd Viscount Dillon of Costello-Gallin1 
He succeeded as the 3rd Viscount Dillon of Costello-Gallin, co. Mayo [I., 1622] in July 1629.2
Thomas Dillon, 4th Viscount Dillon of Costello-Gallin1 
He succeeded as the 4th Viscount Dillon of Costello-Gallin, co. Mayo [I., 1622] on 13 May 1630.2 He held the office of Jointt Governor of Mayo in November 1641.1 He held the office of Joint Lord President of Connaught.2 He held the office of Governor of the Fort of Athlone on 27 April 1645.2 He was exiled and his estates sequestrated during the Commonwealth but he recovered them at the Restoration.2 He held the office of Custos Rotulorum of County Westmeath in 1662.2 He has an extensive biographical entry in the Dictionary of National Biography.3

Children of Thomas Dillon, 4th Viscount Dillon of Costello-Gallin and Frances White
- Hon. Rupert Dillon2
- Thomas Dillon, 5th Viscount Dillon of Costello-Gallin+2 d. 1674
- General Hon. Charles Dillon2 b. 1636, d. b 1674
Frances White1
After her marriage, Frances White was styled as Viscountess Dillon of Costello-Gallin in 1635. From 1635, her married name became Dillon.
Children of Frances White and Thomas Dillon, 4th Viscount Dillon of Costello-Gallin
- Hon. Rupert Dillon2
- Thomas Dillon, 5th Viscount Dillon of Costello-Gallin+2 d. 1674
- General Hon. Charles Dillon2 b. 1636, d. b 1674
General Hon. Charles Dillon1 
He held the office of Governor of Tournai.2 He gained the rank of General in the French and Spanish Armies.1
Hon. Rupert Dillon1 
He held the office of Page to King Charles II.1
Thomas Dillon, 5th Viscount Dillon of Costello-Gallin1 
He succeeded as the 5th Viscount Dillon of Costello-Gallin, co. Mayo [I., 1622] in 1673/74.2
Children of Thomas Dillon, 5th Viscount Dillon of Costello-Gallin and Elizabeth Burke