I believe that as a child he was wounded by the tusk of a wild boar when he was out hunting with some relatives (grandfather and uncle), and that wound left a scar on him.
A phoenix simply means a legendary bird that lived 500 years, burned itself to ashes on a pyre, and rose alive from the ashes to live another period.
The phoenix is an immortal bird that is associated with Greek mythology as it regenerates or is otherwise born again.
The phrase "To rise like a phoenix from the ashes" implies that the person emerges from a catastrophe stronger, and more powerful.
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Hipposaurus is an extinct genus of basal therapsids known from the Tapinocephalus Assemblage Zone of the Main Karoo Basin, South Africa. Chronologically this is within the Capitanian stage of the Guadalupian Series.