Knight
A horse samurai is also known as a knight. Onward, knights of the round! Off to find the holy grail!
きし
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
その騎士は、アメリカ国旗を掲げることを断った。
The knight refused to fly the American flag.