Parlog
Parlog is a logic programming language designed for efficient utilization of parallel computer architectures. Its semantics is based on first order predicate logic. It expresses concurrency, interprocess communication, indeterminacy and synchronization within the declarative language framework.

It was designed at Imperial College, London by Steve Gregory and Keith L. Clark, as a descendant of IC Prolog and Relational Language.

Further reading

Tom Conlon, "Programming in Parlog", Addison-Wesley

References

Logic programming languages
Concurrent programming languages
Academic programming languages
Dynamically typed programming languages