▁of ▁the ▁oldest ▁in ▁Europe ▁and ▁can ▁be ▁trac ed ▁to ▁ 1 8 6 CE ▁to ▁its ▁first ▁mention ▁in ▁the ▁Franco - R oman ▁Census ▁found ▁near ▁J äg st hausen . ▁The ▁ancient ▁ham let ▁of ▁O ln hausen , ▁Germany ▁ ▁near ▁Heil br onn ▁is ▁still ▁in ▁existence . ▁ ▁The ▁name ' s ▁meaning ▁is ▁' house ▁of ▁e el '. ▁Several ▁O hl hausen ▁family ▁cr ests ▁bear ▁a ▁house ▁and ▁e els . ▁A el / ahl / ohl ▁are ▁all ▁German ic ▁ ▁et ym ological ▁variations ▁of ▁the ▁English ▁word ▁" e el ". ▁ ▁Vari ations ▁of ▁the ▁name : ▁O ln hausen , ▁O hl hausen , ▁Ol hausen , ▁A el hausen , ▁etc . ▁ ▁People ▁Hen rich ▁von ▁O ln hausen ▁- K n ights ▁Tem pl ar ▁of ▁the ▁Cr us ades , ▁con ferred ▁the ▁Order ▁of ▁the ▁Golden ▁Sp ur ▁in ▁ 1 3 8 8 ▁at ▁Jerusalem ▁Mary ▁Ph in ney ▁von ▁O ln hausen ▁( 1 8 1 8 – 1 9 0 2 ) ▁Civil ▁War ▁Nur se , ▁whose ▁explo its ▁during ▁the ▁American ▁Civil ▁War ▁were ▁chron ic led ▁in ▁" Ad vent ures ▁of ▁an ▁Army ▁Nur se ▁in ▁Two ▁Wars : ▁Baron ess ▁von ▁O ln hausen " - by ▁Mary ▁Ph in ney , ▁ 1 9 0 3 ▁Ma ure en ▁O hl hausen ▁- Att orney , ▁Federal ▁Trade ▁Commission er ▁appointed ▁by ▁Bar ack