umer ▁Z war te ▁Ho op ▁( called ▁" G el der se ▁F rie zen " ▁in ▁the ▁series ). ▁ ▁Although ▁intended ▁as ▁a ▁children ' s ▁series , ▁it ▁was ▁very ▁popular ▁with ▁adult s ; ▁for ▁example , ▁Flor is ' s ▁sword ▁fight ▁with ▁two ▁s words ▁in ▁the ▁castle ▁in ▁the ▁first ▁episode ▁looks ▁surprising ly ▁real istic . ▁The ▁series ▁also ▁had ▁an ▁educational ▁element : ▁custom s , ▁like ▁time keep ing ▁with ▁b ells , ▁and ▁the ▁origin ▁of ▁words ▁such ▁as ▁vern ag elen ▁(' to ▁sp ike ▁down '), ▁are ▁explained ▁by ▁example . ▁While ▁Flor is ▁is ▁port rayed ▁as ▁a ▁typical ▁kn ight - h ero ▁– ▁not ▁too ▁bright ▁but ▁a ▁good ▁s words man ▁– ▁S ind ala ▁is ▁the ▁clever ▁one , ▁using ▁Oriental ▁scientific ▁knowledge ▁for ▁practical ▁applications ▁( which ▁also ▁had ▁educational ▁value ). ▁ ▁Loc ations ▁included ▁the ▁medieval ▁castle ▁of ▁De ▁Do orn en burgh , ▁close ▁to ▁Do orn enburg ▁in ▁the ▁Dutch ▁province ▁Gel der land ▁( part ▁of ▁the ▁historical ▁Gu eld ers ), ▁and ▁the ▁Belg ian ▁cities ▁of ▁Bru ges ▁and ▁Gh ent . ▁ ▁Coll abor ation ▁The ▁series ▁was ▁the ▁first ▁major ▁undert aking ▁of ▁both ▁H auer ▁and ▁Ver ho even , ▁as ▁well ▁as ▁their ▁first ▁collaboration . ▁It ▁was ▁followed ▁by ▁Turkish ▁Del ight ▁( T ur ks ▁F ruit ) ▁and ▁Sold ier ▁of ▁Orange ▁( S old a at ▁van ▁O