Flag of Valdivia

Flag of Valdivia
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The city flag of Valdivia, Chile is a red saltire (crux decussata, X-cross or St. Andrew's cross) on a white field. It is thought to have originated from the Spanish cross of Burgundy, as the city of Valdivia was an important stronghold of the Spanish Empire.

Valdivia was a royalist stronghold during the Spanish-American War of Independence, so the symbol alludes to that loyalty.

It is the same as the international maritime signal flag for the letter V and the meaning "I require assistance".