They had their own "languages" - Turbo Pascal (Delphi) and Borland C++, while not "new" languages, they were both very specific to Borland in their own ways. Their IDE's were much better than just about anything else available at the time. Then they made mistakes and competition came in big time (Visual Studio iirc). Anyway, it was a "long" time ago and I don't remember all of the details, but that's the gist of it.

I'm sure someone will be happy to correct anything I got wrong :)

edit: I don't think this will happen to JetBrains. edit2: Forgot the "Delphi" name, but it was basically TP w/ libraries.