History of Object-oriented programing languages

The two first object-oriented programing laguages were SIMULA I and SIMULA 67
SIMULA I- was developted between years 1961 and 1964.
SIMULA67-was developted at 1967.
Both these languages were created by Ole-Johan Dahl and Kristen Nygaard in Norwegian Computing Centre in Oslo,Norway.
As it's name suggest SIMULA67 was created and developted for simulations of battle ships.
The ideas of Simula 67 influenced many later languages, especially Smalltalk and derivatives
of LISP and PASCAL.

SIMULA67as first programing laguage in history introduced most of the key concepts of object-oriented programming:
Objects and classes.