Rupert's Land, or Prince Rupert's Land, was a territory in British North America, consisting mostly of the Hudson Bay drainage basin that was nominally owned by the Hudson's Bay Company for 200 years from 1670 to 1870, although numerous aboriginal groups lived in the same territory and disputed the sovereignty of the area. The area once known as Rupert's Land is now mainly a part of Canada, but a small portion is now in the United States of America. It was named after Prince Rupert of the Rhine, a nephew of Charles I and the first Governor of the Hudson's Bay Company. In December 1821 the HBC monopoly was extended from Rupert's Land to the Pacific coast.

Areas once belonging to Rupert's Land include all of Manitoba, most of Saskatchewan, southern Alberta, southern Nunavut, northern parts of Ontario and Quebec, as well as parts of Minnesota and North Dakota and very small parts of Montana and South Dakota.

In 1670, the Hudson's Bay Company (HBC) was granted a charter by King Charles II, giving it a trading monopoly over the watershed of all rivers and streams flowing into Hudson Bay, thereby making the HBC owners of the whole of Rupert's Land (named in honour of Prince Rupert of the Rhine, the king's cousin and the company's first governor). This covered an area of 3.9 million square kilometres (1.5 million sq mi), over one-third the area of Canada today.

Joe Penna (born May 29, 1987 in São Paulo), known online as MysteryGuitarMan, is a Brazilian guitarist, animator, and filmmaker. He currently resides in Los Angeles, California.

Penna maintains a popular channel on YouTube by the name of MysteryGuitarMan. He usually uploads videos every Thursday.

In January 2011, he was the most subscribed in Brazil. As of May 2012 his channel has over 2.1 million subscribers, and his videos have been viewed over 315 million times.

On February 18, 2010, Penna started a second YouTube channel, jp, where he uploads his making-of videos and vlogs. Within 6 hours, it became the third most subscribed channel in Brazil.

In 2007, Penna received media coverage, including attention from DC Fox News, after his "The Puzzle" video was featured on the front page of YouTube.

In 2009, Penna was again seen on the front page of YouTube with his "Guitar: Impossible" video, which has been covered by De Wereld Draait Door, the highest-rated primetime show in the Netherlands. On December 6, 2009, Penna was featured on FM4, an Austrian national radio station. Shortly after uploaded, his "Guitar:Impossible" video was featured on the MSN.com front page.