Edgar Feuchtwanger, a German-born British historian who, as a Jewish child in 1930s Munich, had an intimate view of the rise of the Nazi Party through the daily life of one of his closest neighbors, Adolf Hitler, died on Aug. 22 at his home in Winchester, England, southwest of London. He was 100.

His daughter Antonia Cox confirmed the death.

Dr. Feuchtwanger (pronounced FOISHT-vanger) was just 5 in 1929 when Hitler used the proceeds from his best-selling political manifesto, “Mein Kampf,” to buy a nine-room apartment across the street from his family in their upscale Munich neighborhood.

The Feuchtwangers were a prominent family of Bavarian Jews: Edgar’s father, Ludwig, was a lawyer and book publisher; his uncle, Lion, was among the country’s best-known playwrights and novelists and an acidic critic of the Nazis whose 1930 book, “Success,” skewered the party and its leader.

Yet Hitler seemed to have no idea that the family lived directly across from him.

Dr. Feuchtwanger recalled one encounter, not long after Hitler won election as chancellor in 1933.

“Just as we passed his front door, Hitler came out, wearing a mackintosh and a trilby hat,” he told The New York Times in 2016. “There were some people in the street who shouted ‘Heil Hitler.’ Then he looked at me and my nanny, quite benevolently.”

Hitler got into his car, oblivious.

“If he had known who I was, it would have been quite different,” Dr. Feuchtwanger said.