Question: The Battle of Champions was fought between Girnigoe Castle and a tower currently operated as a venue by what company?

Context articles: University Club Tower (Tulsa)
James von Klemperer
JB Tower
Ackergill Tower
Battle of Champions
Al Rajhi Tower
Marathon Oil Tower
Liberty Tower (Tulsa)
List of tallest buildings in South Korea
Wedge International Tower

The University Club Tower is a residential high-rise building in Tulsa, Oklahoma.
 The building rises 377 feet (115 m).
 It contains 32 floors, and was completed in 1966.
 The University Club Tower currently stands as the 8th-tallest building in the city, and the 14th-tallest building in the state of Oklahoma.
 It also currently stands as the tallest all-residential building in Tulsa and Oklahoma.
 The circular building, marked by unusual floorplans surrounding its central core, was the first major building in the United States to be designed using a computer.
James von Klemperer is a New York-based American architect.
 He is president of the architectural firm of Kohn Pedersen Fox (KPF).
 He is known for his contributions to the designs of new cities, urban mixed-use clusters, and supertall buildings, including the One Vanderbilt tower currently under construction next to Grand Central Terminal in Manhattan.
 He established KPF's practice in Asia in the early 1990s.
 James von Klemperer led the design of the Lotte World Tower, currently the world's fifth tallest building.
JB Tower is a commercial tower currently approved for construction in Downtown Burj Dubai, Dubai.
The tower will rise 240 meters and will have 60 floors.
Ackergill Tower (or Ackergill Castle) is located north of Wick, Caithness, in northern Scotland.
 It was built in the early 16th century, and is a category A listed building.
 Ackergill is currently operated as an events and wedding venue by AmaZing Venues.
The Battle of Champions was a trial by combat fought in 1478 or 1464 between two Scottish clans, Clan Gunn and Clan Keith.
 It took place at the chapel of St Tears (St Tayre) on the coast north of Wick in Caithness, between Ackergill Tower and Girnigoe Castle.
 It was arranged to settle a dispute with a battle between twelve men on horseback on either side.
 However, the Keiths arrived with two men on each of their twelve horses, and massacred the 12 Gunns.
 The clans finally signed a treaty of friendship in 1978, ending the feud after 500 years.
Al Rajhi Tower (Arabic: برج الراجحي) is a $500 million USD tower currently proposed for Riyadh, Saudi Arabia.
 Designs for the sail-shaped tower have been drawn up by architects at Atkins.
 The tower is being built on behalf of the Al Rajhi family and will be used for commercial purposes.
 The family, considered by most in Saudi Arabia, as the country's wealthiest non-royals, is among the world's leading philanthropists.
Marathon Oil Tower is a skyscraper in Uptown Houston.
 The building rises 562 ft in height.
 It contains 41 floors, and was completed in 1983 and construction only took 22 months.
 First City Tower currently stands as the 20th-tallest building in the city.
 The architectural firm who designed the building was Pierce Goodwin Alexander & Linville.
Liberty Tower, officially Liberty Tower Condominiums, is a commercial/residential high-rise building complex in Tulsa, Oklahoma.
 The building rises 254 feet (77 m).
 It contains 24 floors, and was completed in 1965.
 Liberty Tower currently stands as the 11th-tallest building in the city, and the 25th-tallest building in the state of Oklahoma.
 It also currently stands as the 2nd-tallest commercial-residential building in Tulsa, after the University Club Tower, and the 3rd-tallest in the state.
 Liberty Tower is the 5th-tallest international style skyscraper in the city, behind the Cityplex Tower, the First Place Tower, the University Club Tower and Cityplex West Tower.
This list of tallest buildings in South Korea ranks skyscrapers in South Korea by height.
 The tallest building in South Korea is currently the 123–story Lotte World Tower, which rises 555 m and was completed in 22nd December 2016.
 It is also the world's 5th tallest building.
 There are currently three buildings over 300m under construction in South Korea.
 The three-building complex Haeundae LCT The Sharp in also under construction in Busan, and will reach 412 m .
 There are various other projects planned over 300 meters, including the 338 m tall Parc1, scheduled to resume construction in 2016, the 510 m tall Busan Lotte Tower currently on hold, as well as the 553 m tall Hyundai Global Business Center slated for completion in 2021.
Wedge International Tower, usually capitalized as WEDGE International Tower, is a skyscraper in Houston, Texas.
 The building was formerly known as the Southwest Bank of Texas Building, Unitedbank Plaza, and 1415 Louisiana.
 The building rises 551 ft in height.
 It contains 43 floors, and was completed in 1983.
 Wedge International Tower currently stands as the 21st-tallest building in the city.
 The architectural firms who jointly designed the building were 3D/International and Nasr/Penton & Associates.
 The building is currently named after its primary tenant, WEDGE Commercial Properties; the firm purchased the building in October 1994 at a price between US$25,000,000 and $45,000,000, and the structure serves as its corporate headquarters.
 In 1989 Exxon had office space in the Wedge International Tower.