History
At the time quantum mechanics was developed, physicists attempted to extend its range of application by formulating versions of the Schrödinger equation that were compatible with special relativity.
The first such equation was discovered by Erwin Schrödinger himself; however, he realized that this equation, now called the Klein–Gordon equation, gave incorrect results when used to calculate the energy levels of hydrogen. Schrödinger discarded his relativistic wave equation, only to realize a few months later that its non-relativistic limit (what is now called the Schrödinger equation) was still of importance.
Read more about this topic: Relativistic Wave Equations
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