Slitherine

There were many of these with the period covered such as Alexander the Great, Antigonous Monopthalmus and others. Even some monarchs with far less military talent quite frequently led armies into battle, With this in mind should the ruling monarch not be included in the commander's pool whether or not he has military talent. That way he can have the option of leading his armies in battle, Perhaps his august presence might, assuming he isn't completely hopeless inspire the men improving their morale. There is also the risk that he might get killed in which case his death would incur a morale penalty pf some severity. Which should deter those tempted too use this as a means of disposing of a lousy ruler from doing so too readily