This happened in the early 1960s, in independent work of Klaus Roth and Enrico Bombieri.
Philip Roth | Klaus Kinski | Klaus Schulze | Klaus Badelt | David Lee Roth | Eli Roth | Uli Jon Roth | Joseph Roth | Klaus Barbie | Klaus Nomi | Klaus Mertens | Klaus Huber | Klaus Ebner | Evan Roth | Ed Roth | Claudia Roth | William V. Roth, Jr. | Václav Klaus | Tim Roth | Klaus Ploghaus | Klaus Maria Brandauer | Klaus Knopper | Klaus Fuchs | Arlen Roth | Zeno Roth | Vaclav Klaus | Roth an der Our | Martin Roth | Klaus Theweleit | Klaus Schwab |