behalf (n.), especially: in behalf (of) 1
advantage, interest, benefit
3H6 II.i.114 [Warwick to Edward and Richard] I ... / Marched toward Saint Albans ... / Bearing the King in my behalf along [i.e. for my own advantage]
AW IV.iii.310 [First Lord to Parolles] a copy of the sonnet you writ to Diana in behalf of the Count Rossillion
AYL V.iv.203 [Rosalind as Epilogue] I ... cannot insinuate with you in the behalf of a good play
KJ I.i.7 [Chatillon to King John, of Philip of France's claim] in right and true behalf / Of thy deceased brother Geoffrey's son