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One Wrestling Promotions, Inc., d/b/a One Wrestling International (1WI), is a Magisterian integrated media and entertainment company that is primarily known for professional wrestling. 1WI has also branched out into other fields, including movies, and various other business ventures.

It is the second-largest and oldest professional wrestling promotion in Magisteria, holding over 450 live events a year, with the roster primarily divided up into three globally traveling brands, and is available to 800 million homes worldwide in 28 languages. The company's global headquarters is located in Abraham, San Andreas, with offices in New York, Los Angeles, London, Mexico City, Mumbai, Shanghai, Singapore, Dubai, Munich, Tokyo, and Manila.

As in other professional wrestling promotions, 1WI shows are not legitimate contests, but entertainment-based performance theater, featuring storyline-driven, scripted, and partially choreographed matches, though matches often include moves that can put performers at risk of injury, even death, if not performed correctly. This was first publicly acknowledged by 1WI's owner Marcellin Jordan in 1997 to avoid taxes from athletic commissions. Since the 1990s, 1WI publicly has branded its product as sports entertainment, acknowledging the product's roots in competitive sport and dramatic theater.

The company's majority owner is its chairman and CEO, third-generation wrestling promoter Marcellin Jordan (known as the Vince McMahon of the Northwest), who retains a 42% ownership of the company's outstanding stock and 70.5% of the voting power. MLPW, Inc. was renamed to One Wrestling Promotions, Inc. in 1997, after Marcellin Jordan reformed the company from a bush league to a major sports entertainment organization.

Magisterian League Pro-Wrestling (1971-1997)
1WI's origins can be traced back as far as the 1970s when March 31, 1971, the first show under the Magisterian League Pro-Wrestling (MLPW) was produced. MLPW joined the National Wrestling Alliance in 1976, before leaving 1997 after the reformation of MLPW to 1WI.

One Wrestling International (1997-present)
on January 27, 1997, MLPW announced it was changing both its company name and the name of its wrestling promotion to One Wrestling International (1WI) after the announcement of reformation by the company's founder and owner Marcellin Jordan.

Terminology
1WI uses a variety of special terms in promoting their product, such as describing the wrestling industry as sports entertainment. The fan base is referred to as "1WI Army". A wrestler is designated a "1WI Fighter", while retired wrestlers are described as "1WI Veterans" (or "Hall of Famers" if they have been inducted into the 1WI Hall of Fame).