Amadeus Arkham was created in 1989.
You can find Amadeus Arkham's spirit in Batman: Arkham Asylum in the Penitentiary Chapel, which is located in the Sanatorium. This is where Batman encounters the spirit of Amadeus Arkham, who tells him about his tragic past and how he became consumed by his own madness.
Amadeus Arkham is the founder of Arkham Asylum. His spirit is said to haunt the asylum after he was driven to madness by the loss of his mother and sister, leading him to become a patient in his own institution. His spirit is associated with the tragic history and haunting atmosphere of Arkham Asylum in the Batman universe.
Amadeus Quartet was created in 1947.
Amadeus IT Group was created in 1987.
Amadeus Cho was created in 2006.
Amadeus - airline - was created in 1996.
Jeremiah Arkham was created in 1992.
The Arkham Sampler was created in 1948.
Arkham House was created in 1939.
Little Amadeus was created on 2006-01-16.
Amadeus Revenge was created on 1988-01-01.
Wolfgang Amadeus Phoenix was created in 2008.