After traveling to Tang China to study, Kukai was the founder of the Shingon school of Buddhism. See how his return to a politically fraught Japan created the opportunity to spread his teachings.
Kukai completed training that normally takes 
twenty years in the span of six months,
Kukai completó un entrenamiento
de 20 años en seis meses
Kukai completou o treinamento
que duraria 20 anos em seis meses,