Fernand Halphen
Fernand Gustave Halphen( born February 18, 1872 – May 16, 1917) was a French Jewish composer.
Obata Toramori
He was the father of Obata Masamori.
Anacyndaraxes
Anacyndaraxes was the father of Sardanapalus, king of Assyria.
John Templeton (botanist)
John Templeton( 1766–1825) was an early Irish naturalist and botanist.
He is often referred to as the" Father of Irish Botany".
He was the father of naturalist, artist and entomologist Robert Templeton.
Georges Henri Halphen
Georges-Henri Halphen (30 October 1844, Rouen – 23 May 1889, Versailles) was a French mathematician.
He was known for his work in geometry, particularly in enumerative geometry and the singularity theory of algebraic curves, in algebraic geometry.
He also worked on invariant theory and projective differential geometry.
Cleomenes II
Cleomenes II( died 309 BC) was Agiad King of Sparta from 369 to 309 BC.
The son of Cleombrotus I, he succeeded his brother Agesipolis II.
He was the father of Acrotatus I, the father of Areus I, and of Cleonymus, the father of Leonidas II.
Inoue Masaru (bureaucrat)
Viscount was the first Director of Railways in Japan and is known as the" father of the Japanese railways".
Arthur Beauchamp
Arthur Beauchamp( 1827 – 28 April 1910) was a Member of Parliament from New Zealand.
He is remembered as the father of Harold Beauchamp, who rose to fame as chairman of the Bank of New Zealand and was the father of writer Katherine Mansfield.
Éric Halphen
Éric Halphen( born 10 October 1959) is a French judge best known as the investigating magistrate in the Parisian low- cost housing scandals of the 1990s.
Louis Halphen
Louis Sigismond Isaac Halphen (4 February 1880, Paris – 7 October 1950, Paris) was a French medieval specialist and the author of many important books over a long career.
He was noteworthy as the editor of a modern edition of the famous classic Einhard's "Vie de Charlemagne" (Paris, 1947), He was also known as being one of the general editors of the monumental series "Peuples et civilisations".
Louis Halphen was born in Paris to mathematician Georges Henri Halphen.
He married Germaine Weill, the daughter of Mathieu Weill, in 1910, with whom he had two children: Étienne and Geneviève.

Question: What is the place of birth of Louis Halphen's father?
Answer: Rouen