Once you have located all the non-jewish rulers and kings in the grid, the remaining letters will spell out another well known King.

ABIMALECHM
DNAUGUSTUS
OETXREGAGA
NRIIIJABIN
IOBLPGOOLB
ZNEEPACCHA
EORFAHSEML
DLIIZEDNEL
EGUOILLAGA
KESUTSEFKT

ABIMALECH
AUGUSTUS
JABIN
SANBALLAT
ADONIZEDEK
EGLON
MESHA
TIBERIUS
AGAG
FELIX
NECO
AGRIPPA
FESTUS
NERO
ANTIPAS
GALLIO
OG

solution...