Conversation so far:
What legacy did lapu leave behind?
Lapu-Lapu is regarded, retroactively, as the first Filipino hero.
Why was he regarded as this?
According to local legend, Lapu-Lapu never died but was turned into stone, and has since then been guarding the seas of Mactan.
How did this legend begin?
CANNOTANSWER.

Question: What other legends were told about him?
Self-contained rewrite: What other legends were told about Lapu-Lapu in addition to turning to stone and guarding the seas of Mactan?