First of all, Proof-of-History is a way to achieve higher TPS, it's not a consensus mechanism to validate blocks.
Solana is the talk of the town these days with a slew of stories, hence throwing some light on Solana's Proof of History and how it gets such a great throughput can be helpful. Solana uses Proof-of-stake for achieving the consensus while Proof-of-history is used to achieve higher TPS. Moreover, Solana has 8 major innovations at different levels of the protocol; it's prudent to write about each innovation in a separate post starting with the Proof of History Innovation here.