ALGOL 60, in 1977.

The languages I consider 'beautiful' are: Smalltalk Eiffel Python Occam (Although I never used any of them, except Eiffel). The 'ugliest': Forth FORTRAN BASIC C/C++ APL any Assembler, of course. My beauty criteria are: simplicity (small number of base elements), consistency, code readability. The more beautiful a language is, the harder it is to write a buggy program, given that the developer has a sense of aesthetics (although no language can guarantee that programs are bug-free). Roman