Because of the branding change, history will remember the Pentium (P5). It was really the Pentium Pro (P6) that put Intel leaps ahead on x86 microarchitecture, a lead they’d hold with only a few minor stumbles for two decades.
Bob Colwell (mentioned elsewhere ITT) wrote a fascinating technical history of the P6: The Pentium Chronicles.
The major stumble being having to cross licence AMD for the x64 opcode design thus ensuring at least two players in the field (and due to how it's going only two).