In Memoriam A.H.H. was created in 1850.
Yes, the term 'in memoriam' is a noun, defined as 'in memory of'. Note: All of the (5) dictionaries that I consulted list the term 'in memoriam' under the letter 'i', there was no listing under 'm' for the word 'memoriam'. This leads me to believe that 'in memoriam' is an 'open compound noun'.
In Memoriam - album - was created on 2005-03-29.
Making in MemorIAM - 2011 was released on: USA: 2011
In Memoriam - 2003 is rated/received certificates of: Germany:6
In memoriam. Literally means "into memory."
The cast of In Memoriam - 2008 includes: Curtis Matthew as Karl
The cast of In memoriam - 1971 includes: Spyros Sakkas as Singer
Memoriam - 2001 TV is rated/received certificates of: Ireland:15
The cast of Manhattan in Memoriam - 2009 includes: Richelle Blauvelt as Tina
In memoriam
Memorian means in memory of.