King James I of England
Italy had a thriving silk industry from the 13th century and France from the 15th century, using both black and (predominantly) white mulberry leaves to feed their silkworms. In letters of 1607 and 1608 King James I of England asked the nobility to plant 10 000 mulberry trees to support an English silk industry to rival that of the continent.
Silk production didn't take off in England, though, perhaps because black mulberries were planted and not white, which produces finer silk. Perhaps the cool, damp climate wasn't right. James did plant thousands of white mulberries in Virginia, though, where the tree thrives, but this colonial silk production still didn't take off.