King Asoka, see
http://www.humanistictexts.org/asoka.htm
Ashoka
Asoka
its ashoka the king
King did not approve of the use of violence. Malcolm X was an advocate of black nationalism. Malcolm X rejected nonviolent protests
Asoka was the name of the king who spread Buddhism.
Puritans rejected the idea of king appointed church leaders
Asoka was the famous king of Maurya who renounced violence.
He did not. We know that he helped the Buddhism to expand, by building temples and promoting the freedom of religion. But he was more on the philosophical side of Buddhism as a Greek, see the questions of King Milinda. Still because of him and earlier King Asoka, Buddhism became a religion from a philosophical movement.
They rejected it several times.
To an extent yes, it is true. According to Mythology lord Asoka after embracing Buddhism punishde those who committed animal slaughter and other violence acts.
Askoa was the famous king of the Mauryan Empire who renounced violence.
Asoka
King Ezana of Axum converted to Christianity.