Companion attending king is peerless - the woman's a saint (11)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

CH (abbreviation for Companion of Honour) + R (abbreviation for Latin Rex = King) + IS + TOP (peerless = excellent) + HER (the woman’s = belonging to a specific woman). St Christopher, traditionally the patron saint of travellers.