Having grown tired of watching Famous Battle Markers all over the map; and with no discernable way to prevent them from appearing; I was hoping to use the ESF Editor to manually remove them from the save game. I got far enough that I found where their information is stored:

CAMPAIGN_SAVE_GAME -> CAMPAIGN_ENV -> CAMPAIGN_MODEL -> MARKER_MANAGER -> FAMOUS_BATTLE_BLOCK

Unfortunately, removing the individual entries from this directory causes the save game to crash the game. So, somewhere, there must be additional information stored away referring to the, now deleted, marker. Having not been able to figure it out myself, I am now reaching out to the community and asking for your help. Does anyone know anything that could be of use to me here?