▁designed ▁to ▁be ▁a ▁def ensive ▁for tr ess . ▁When ▁it ▁was ▁originally ▁constructed , ▁it ▁had ▁a ▁central ▁cour ty ard , ▁surrounded ▁by ▁four ▁heavy ▁to wers ▁on ▁the ▁corners . ▁ ▁Connect ing ▁these ▁four ▁to wers ▁were ▁four ▁heavy ▁wings , ▁one ▁on ▁each ▁side ▁of ▁the ▁cour ty ard . ▁ ▁Am mers o yen ▁Castle ▁is ▁a ▁good ▁example ▁of ▁the ▁type ▁of ▁castle ▁that ▁was ▁made ▁famous ▁by ▁Count ▁Flor is ▁V ▁of ▁Holland . ▁Even ▁though ▁it ▁was ▁originally ▁built ▁on ▁a ▁river , ▁the ▁Van ▁Her la ers ▁believed ▁that ▁all ▁four ▁sides ▁of ▁the ▁castle ▁needed ▁to ▁be ▁fort ified . ▁To ▁add ▁to ▁the ▁security , ▁the ▁original ▁design ▁included ▁a ▁mo at ▁that ▁ens ured ▁any ▁attack er ▁could ▁only ▁in va de ▁through ▁the ▁front ▁of ▁the ▁for tr ess . ▁ ▁Ex cept ▁for ▁a ▁brief ▁period ▁in ▁the ▁early ▁ 2 0 th ▁century , ▁the ▁castle ▁has ▁always ▁been ▁completely ▁surrounded ▁by ▁the ▁mo at . ▁ ▁The ▁castle ▁was ▁built ▁using ▁a ▁fixed ▁plan , ▁something ▁that ▁was ▁quite ▁un common ▁for ▁medieval ▁cast les . ▁ ▁A ▁fixed ▁plan ▁means ▁that ▁the ▁entire ▁castle ▁was ▁built ▁as ▁a ▁whole , ▁as ▁opposed ▁to ▁multiple ▁phases , ▁which ▁was ▁often ▁the ▁case ▁with ▁other ▁medieval ▁cast les . ▁ ▁Location ▁▁ ▁The ▁earliest ▁mention ▁of ▁Am mer z oden , ▁or ▁Am bers oi ▁as ▁it ▁was ▁once ▁known , ▁was ▁in ▁the ▁ 1