I think this should be read backwards, from right to left. The X's are then used to seperate words. Thus it reads: IURO (I swear by oath) DICNDWHC: The C's could be G's. the N is strange and could be an upside down U, likewise the W could be an M: DIGUDMIC or other alternatives (Dignissimo? Dignos? O DN (O Domines Noster, O, Our Lord) The second word could be a verb meaning something like 'serve'., 'follow'' etc: I swear by oath to... O, Our Lord.