The TFF 1. Lig, currently referred to as Trendyol 1. Lig for sponsorship reasons, is the second level of the Turkish football league system. The league was founded in 2001 as the Turkish Second League Category A after the reorganization of the Second Football League, which was the second level of the Turkish league system between 1963 and 2001. The league was called Türk Telekom Lig A in the 2006–07 season, and was renamed to TFF 1. Lig prior to the 2007–08 season. As of 16 January 2008 the league was renamed as Bank Asya 1. Lig. In April 2012 Bank Asya withdrew as sponsor of the league. During the 2012–2016 seasons the league was known under the terms of a sponsorship deal as the PTT 1. Lig.