Final answer:
Richard III offed the second Duke of Buckingham, Henry Stafford, in 1483 after Stafford led a failed rebellion against him, exemplifying the power struggles of the Wars of the Roses and leading to the eventual rise of the Tudor dynasty.
Step-by-step explanation:
The person who offed the second Duke of Buckingham in 1483 was Richard III. The second Duke of Buckingham, whose full name was Henry Stafford, was a key figure during the tumultuous period of English history known as the Wars of the Roses. He initially supported Richard III's claim to the throne, but later led a rebellion against him. The rebellion failed, and Stafford was captured and executed by Richard III. This incident is just one example of the power struggles that were characteristic of the time, as different factions vied for control of the English throne. These ongoing conflicts led to significant shifts in power, such as the rise of the Tudor dynasty following Henry Tudor's (Henry VII) victory at the Battle of Bosworth Field in 1485.