Project Management is an ancient profession – we can certainly trace it over 1,000 years, although project managers would have been called “Administrators”, or “Architects”. Project Management as a discipline goes back at least 100 years, as does the Iron Triangle.
I argue on the APM (Association for Project Management) website
https://www.apm.org.uk/blog/an-age-of-benefits-and-value-management/ that Project Management has lost its way recently, and we need to refocus.