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Famous people · Lagnieu, Ain

Lagnieu’s famous people span 101 years: 6 births from 1824 to 1925

Denis Defforey, the French entrepreneur and businessperson, is the most widely known, written about in 5 languages. Close behind are Joseph Rollet and Julien Barbero. 3 of them were born between the Revolution and the Second Empire, more than in any other period. The list’s best known name, Denis Defforey, dates from 1925.

#2 best knownJoseph RolletScience & Medicine · 1824–1894
+4more
Born here
6
confirmed by Wikipedia
Best known
Denis Defforey
5 Wikipedia and sister-site articles
First
1824
Joseph Rollet
Youngest
1925
Denis Defforey
Most common field
Science & Medicine
2 people
The best known

Born in Lagnieu

The three are covered in 5, 4 and 4 languages: Denis Defforey, Joseph Rollet and Julien Barbero.

DD#1
Business

Denis Defforey

1925–2006

French entrepreneur and businessperson (1925-2006)

5 Wikipedia and sister-site articlesWikipedia ↗
Joseph Rollet#2
Science & Medicine

Joseph Rollet

1824–1894

French physician (1824–1894)

4 Wikipedia and sister-site articlesWikipedia ↗
Julien Barbero#3
Politics & Law

Julien Barbero

1870–1936

Politician from France

4 Wikipedia and sister-site articlesWikipedia (French) ↗
Through the years

When Lagnieu’s famous people were born

The busiest decade was the 1920s, with 2 births.

Revolution to EmpireBelle ÉpoqueThe 20th century1800185019001950Joseph RolletDenis DefforeyJulien Barbero
Science & MedicinePolitics & LawBusinessWriting & Arts

Each dot is a person, stacked by the decade they were born.

Known for

What Lagnieu is known for

Science & Medicine leads the fields, with 2 people.

The usual town: the share across everyone listed in French towns. Tap a field to see its people.

Everyone

Everyone else born in Lagnieu

3 more, best known first.

Louis Jean Baptiste Bergeron

Louis Jean Baptiste Bergeron

1876–1948

French engineer (1876-1948)

Science & MedicineWikipedia ↗
Next door

Famous people from the towns next door

Close by, the fullest list is Ambérieu-en-Bugey’s, at 14 names.

Questions about famous people from Lagnieu

Who is the most famous person from Lagnieu?

Denis Defforey (French entrepreneur and businessperson (1925-2006)) is the best known by our measure: 5 Wikipedia and sister-site articles in different languages. Next come Joseph Rollet and Julien Barbero.

How many famous people were born in Lagnieu?

6 people born in Lagnieu have a French Wikipedia article that confirms the town as their birthplace (and an English one that agrees, when there is one). Wikidata places 7 people here; the rest aren’t listed because an article names somewhere else or no town, or a check couldn’t be completed.

What is Lagnieu known for?

Among its famous people, scientists and doctors: 2 of the 6. That is 33% of the town’s list, against 7% across French towns.

Who is the earliest-born famous person from Lagnieu?

Joseph Rollet, born in 1824. The youngest on the list was born in 1925.

Who counts as from Lagnieu?

People whose Wikidata birthplace is Lagnieu itself, matched by its INSEE code (a commune merged into it counts when the dates allow), whose French Wikipedia article agrees, and their English article too when they have one. A hospital or neighbourhood recorded without its commune isn’t matched. People who only lived here, adult performers and people known mainly for crimes aren’t listed.

Why is someone missing?

Their Wikidata birthplace may be a hospital, a neighbourhood or a wider area, another commune, or missing, or their articles may not name a birthplace. We only list people the sources agree on; editing Wikidata or Wikipedia changes this page at the next refresh.

From Wikidata (CC0: birthplaces, descriptions, years, occupations, how many Wikipedia and sister-site articles cover each person) and French and English Wikipedia (each person’s articles confirm the birthplace; linked, not quoted). Birthplaces are matched to the commune by INSEE code and its history of mergers (INSEE COG 2026). Ranked by the number of articles. Fields are read from Wikidata’s description and occupations. “The usual town”: everyone listed across French towns. Portraits: each person’s Wikidata image, from Wikimedia Commons under the license below (our copy, resized).

Photo credits (7)

Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.