To get raja #3 to join raja Eisert, I would tell him that raja Eisert also protected his people while promoting ahimsa. I would also tell him that you really liked the way Siddarta Guatama rule and acted.

Raja #3

I would tell him that raja Eisert protected his people while promoting ahimsa because if he knows you two are similar, there might be a better chance of him agreeing.

I would tell him that you liked the way Siddarta Guatama ruled and acted because he might agree if he knows you like someone from his homeland