What was the first turing-complete language? Know about the first machines and computers, but not the programming language.
Why not read this Wikipedia article.
The first programming languages designed to communicate instructions to a computer were written in the 1950s. An early high-level programming language to be designed for a computer was Plankalkül, developed by the Germans for Z1 by Konrad Zuse between 1943 and 1945. However, it was not implemented until 1998 and 2000.
Also, I think that it is wrong to consider a programming language as such to be Turing Complete since the concept of Turing completeness applies to a computational model, not to a programming language itself. For example, it is Turing machine, RAM machine, or Post systems that is Turing complete and not a set instructions or programming languages used to program them.
If our real life computers had infinite memory we could consider them a Turing machine equivalent to our abstract model we use in CS and Math, meaning that it is not programming languages or instructions sets used to program CPU that makes real life computers not equivalent to the abstract model.