Teemo Tried to Assassinate Jarvan ll

Taken from Xin Zhao's lore.

"Jarvan II, hearing of this unprecedented feat, infiltrated the arena to offer him an alternative: serve Demacia and punish those who ultimately sentence him to death in exchange for his freedom. Xin Zhao accepted, astonished that a king would risk his own life on his behalf. Under the cover of a prearranged Demacian assault on Noxus, Jarvan liberated Xin Zhao and his 300 opponents. During their retreat, Xin Zhao took a poisoned dart meant for Jarvan. This act of loyalty, from a man who vowed no allegiance, earned Xin Zhao a spot at his side until the day the king died."

"During their retreat, Xin Zhao took a poisoned dart meant for Jarvan."

"a poisoned dart meant for Jarvan."