Which car makers first used V8 engines?

Pinpointing the very first car maker to use a V8 engine is difficult due to conflicting historical records and variations in what constitutes a "true" V8 (some early designs had significant differences from modern interpretations). However, Cadillac is generally credited with popularizing and successfully mass-producing the V8 engine for automobiles in 1914. While others may have experimented earlier, Cadillac's L-head V8 was a significant milestone in making the design practical and commercially viable.