In the Antico district near the bottom, there is a break in an overpass where a usual4 guards are almost always positioned there. Attack these guard, either from a horse with air attack from a horse. 2 to 4 mercenaries will also attack and try to kill you. Kill all guard and the mercenaries. Upon doing a search for valuables of the merc's almost all have hard find items, such as Vlad coins etc. Always check the merc's for valuables.