Despite the Holocaust and the post-war Jewish emigration from Hungary, the city today is still home to the biggest Ashkenazi community in continental Europe, an estimated 100,000 people (here, you can read more about the history of Jewish people in Hungary). Hungarian Jews split into three factions in 1869 over a disagreement about assimilation. The central synagogue of each of these three groups comprises the so-called "synagogue triangle" inside Budapest's old Jewish Quarter .
https://www.offbeatbudapest.com/budapest-city-guide/jewish-budapest/synagogues-cemeteries/ 