Who was Simon DeMontfort?

Simon DeMontfort (1025–1087) was born in Montfort, Eure, Haute-Normandie, France and died in Épernon, Eure-et-Loir, Centre, France. 5 researchers on YourRoots have this ancestor in their family trees.

How many people are researching Simon?

Right now, 5 researchers on YourRoots have Simon in their trees. The ancestor migration map traces 2 generations of this lineage.

What records do they have for Simon?

Records vary by researcher and can include census, vital, parish, cemetery, and family sources.

How do I compare family trees?

Use Compare Tree on an available researcher profile to compare overlapping people and records.

Simon I Seigneur Montfort Amauri DeMontfort 1025–1087

Public Tree Person

What is a Public Tree Person?

A Public Tree Person is an ancestor documented independently by multiple YourRoots tree owners. When several researchers' family histories converge on the same person, we publish a shared page that combines what they've documented.

Why this is a Public Tree Person

Full name consistent across 5 independent trees

Birth year and location consistent across 5 trees

Death year and location consistent across 5 trees

Compare a Public Tree Person with your own tree using Compare Tree.

B Reliability

Reliability Score: B

Medium — based on the source tree

Grade scale

A 3 criteria (Strong)
B 2 criteria (Medium)
C 1 criteria (Basic)

Verification checklist

Record available
Descendant's record available
Star tree owner

5 researchers on YourRoots have Simon DeMontfort in their family trees — each with their own records and documentation. Trace the migration path across 2 generations. If this ancestor is in your tree too, you can compare what you've found and fill in the gaps together.

Last updated: July 22, 2026 · Reliability: B — verified across 5 independent trees

Born 1 Nov 1025 · Montfort, Eure, Haute-Normandie, France

Died 25 Sep 1087 · Épernon, Eure-et-Loir, Centre, France

Father Amaury Ii Seigneur De Montfort

Mother Bertrade De Gometz

Spouse Agnes Devreux Countess Monfort

Children Bertrade De Montfort Comtessa D Anjou

Records

Millennium File

Compare Tree

Researchers connected through Simon DeMontfort 1025–1087

and 4 more tree owners connected with Simon DeMontfort 1025–1087

Immediate Family

Parents

Amaury Ii Seigneur De Montfort

Bertrade De Gometz

Spouse(s)

Agnes Devreux Countess Monfort

Children

Bertrade De Montfort Comtessa D Anjou

Biography

In 1025, Simon I Seigneur Montfort Amauri DeMontfort entered the world in Montfort, Eure, Haute-Normandie, France, born to amaury ii seigneur de montfort and bertrade de gometz. Simon I Seigneur Montfort Amauri DeMontfort married agnes devreux countess monfort, and had children including bertrade de montfort comtessa d anjou. Simon I Seigneur Montfort Amauri DeMontfort passed away in 1087 in Épernon, Eure-et-Loir, Centre, France.

Sources

1

Record Millennium File

Life Timeline

1025

Birth of Simon I Seigneur Montfort Amauri DeMontfort in Montfort, Eure, Haute-Normandie, France

Birth

1087

Death of Simon I Seigneur Montfort Amauri DeMontfort in Épernon, Eure-et-Loir, Centre, France

Death

Oldest Ancestor Line from Simon DeMontfort

This ancestor line traces from Montfort, Normandy, France (1000) to Montfort, Eure, Haute-Normandie, France (1025) across 2 generations.

Direct Lineage

generations

Frequently Asked Questions

: Simon DeMontfort (1025–1087) was born in Montfort, Eure, Haute-Normandie, France and died in Épernon, Eure-et-Loir, Centre, France. 5 researchers on YourRoots have this ancestor in their family trees, each with their own records. This page combines what they've independently documented and assigns a Reliability Score (B) based on cross-tree validation.
: Right now, 5 researchers on YourRoots have Simon in their trees. They're working independently, so connecting with them is a good way to cross-check your records and find things you might have missed. You can also explore the ancestor migration map that traces 2 generations of this lineage geographically.
: It varies by researcher — some have census records, others have marriage certificates, parish registers, or family Bible entries. Scroll up to see exactly what each person has cited.
: Use the "Compare Tree" button on any researcher's profile above. You can compare your tree side by side with theirs, see where your records overlap or differ, and collaborate to fill gaps.