Name the explorer based on the information provided.
an indian coast guard was posted at the border of calicut on the malabar coast. he watched for pirate ships and invaders. suddenly, he saw a strange-looking ship with triangular sails moving toward calicut. the guard raised the alarm. when the ship arrived, a man with skin paler than ivory stepped off it. the coast guard had never seen such a pale man. the guard brought the man to the king. there, the man said he was from a distant land called portugal and wanted to trade with india.

based on this passage, we can conclude that the portuguese man was vasco de (answer here)