King of Thessalonica Guglielmo del Monferrato, 12th Marquis of Monferrato

1240 - 1292  (~ 52 years)

• Name	Guglielmo del Monferrato  [1, 2]
  Title	King of Thessalonica
  Suffix	12th Marquis of Monferrato
  Birth	Abt. 1240	Trino, Vercelli, Piemonte, Italy   [2]
  Gender	Male
  Also Known As	il Gran Marchese  [2]
  Also Known As	The Great Marquis  [2]
  Also Known As	William VII of Montferrat  [1]
  Title	12th Marquis of Monferrato
  Death	6 Feb 1292	Alessándria, Alessandria, Piemonte, Italy   [2]
  Burial	Lucedio Abbey, Vercelli, Piemonte, Italy   [2]
  Person ID	I14521	Savoia Genealogy
  Last Modified	17 Apr 2025

  
  

  Father	11th Marquis of Montferrat Bonifacio II del Monferrato, 11th Marquis of Monferrato,   b. Jul 1202   d. 12 May 1253, Moncalvo, Asti, Piemonte, Italy (Age ~ 50 years)
  Mother	Margherita di Savoia
  Marriage	Abt. 983  [3]
  Family ID	F5360	Group Sheet  |  Family Chart

  
  

  Family 1	Beatrice di Castiglia
  Children	1. John III of Brittany, Duke of Brittany   2. son del Monferrato,   b. 1272   d. 1273 (Age 1 year)   3. son del Monferrato,   b. 1272   d. 1273 (Age 1 year)   4. Irene del Monferrato,   b. Abt. 1274   d. 1317 (Age ~ 43 years)   5. Giovanni I del Monferrato, 13th Marquis of Monferrato,   b. Abt. 1275   d. 1305 (Age ~ 30 years)   6. Alessina del Monferrato   d. Bef. 1305
  Family ID	F5359	Group Sheet  |  Family Chart
  Last Modified	28 Apr 2025

  
  

  Family 2	Isabella de Clare,   b. Abt. 1240   d. Bef. 1271 (Age ~ 30 years)
  Children	1. Guigues VI of Viennois   2. daughter del Monferrato   3. Guy II of Bauge, Lord of Bauge   4. Margherita del Monferrato
  Family ID	F5388	Group Sheet  |  Family Chart
  Last Modified	28 Apr 2025

  
  

• Sources

  [S5088] "Ranulf I of Aquitaine," Wikipedia, last modified 30 Jan 2025, https://en.wikipedia.org/wiki/Ranulf_I_of_Aquitaine. [S5089] "Gerard, Count of Auvergne," Wikipedia, last modified 9 Dec 2023, https://en.wikipedia.org/wiki/Gerard,_Count_of_Auvergne. [S5072] "Bertha of Burgundy," Wikipedia, last modified 30 Oct 2024, https://en.wikipedia.org/wiki/Bertha_of_Burgundy.