Short answers, pulled from the story.
Martin Frobisher was an English sea captain and privateer born around 1535 in Altofts, Yorkshire, who made three voyages to the Canadian Arctic searching for the Northwest Passage. He is famous for bringing back 1,350 tons of ore he believed to be gold-bearing, which proved worthless after five years of smelting, and for commanding a squadron that fought the Spanish Armada in 1588.
Frobisher explored Frobisher Bay on present-day Baffin Island, which he believed to be the entrance to the Northwest Passage. On his third voyage in 1578 he also sailed into what is now called Hudson Strait, which he named Mistaken Strait. Frobisher Bay lies close to Iqaluit, the capital of Nunavut.
Frobisher transported a total of 1,350 tons of ore from Baffin Island across his second and third voyages, believing it to contain gold. After five years of smelting at a plant on Powder Mill Lane in Dartford, the ore was found to be a valueless rock containing hornblende. The Cathay Company went bankrupt as a result, and financier Michael Lok was sent to debtors' prison multiple times.
Frobisher commanded Triumph, the Royal Navy's largest ship, and led one of four English fleet squadrons during the Armada campaign in the summer of 1588. He engaged the Spanish flagship San Martin off the Isle of Wight on the 25th of July 1588 and fought in the decisive battle off Gravelines on the 29th of July. Lord Howard knighted him on the 26th of July 1588 aboard the flagship Ark Royal.
Frobisher died on the 22nd of November 1594 at Plymouth from an infected wound. He was shot in the thigh during the siege of Fort Crozon, a Spanish-held fortress near Brest in Brittany, and the surgeon who removed the musket ball left the wadding behind, causing a fatal infection. His heart was buried at St Andrew's Church, Plymouth, and his body at St Giles-without-Cripplegate in London.
Frobisher was arrested multiple times between the early 1560s and 1570 for privateering beyond the limits of his licenses, including seizing Protestant ships carrying English goods and a Spanish vessel whose capture resulted in the deaths of 40 Englishmen. He was imprisoned at Fleet prison and Marshalsea in 1569 and released in March 1570 through the intervention of the lord admiral Edward Fiennes de Clinton and secretary of state William Cecil.