Final answer:
Zacharias Janssen is the Dutch spectacle maker who built the very first compound microscope.
Step-by-step explanation:
The Dutch spectacle maker who built the very first compound microscope is Zacharias Janssen. Along with his son Hans, Janssen was experimenting with several lenses in a tube and discovered that nearby objects appeared greatly enlarged, or magnified. This discovery was the precursor to the compound microscope and the telescope.