How many letters does the top answer for “war that began in 1454” have?

The most common answer is flowerwar (9 letters).

Crossword clue: war that began in 1454

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

flowerwar 9 letters wd-fact-v3

thirteenyearswar 16 letters wd-fact-v3

war that began in 1051 100% similar → zenkunenwar

war that began in 1095 100% similar → crusades

war that began in 1096 100% similar → firstcrusade, peoplescrusade

war that began in 1135 100% similar → theanarchy

war that began in 1147 100% similar → secondcrusade

war that began in 1156 100% similar → hogenrebellion

war that began in 1160 100% similar → heijirebellion

war that began in 1180 100% similar → genpeiwar