Turkish middle-distance runner Asli Cakir-Alptekin has been stripped of the gold medals she won at the London Olympics and 2012 European Championships for doping, the Court of Arbitration for Sport has announced.
The 29-year-old has also been banned for eight years, meaning she is ineligible to compete until January 9, 2021.
The decision is a result of an arbitration procedure between world governing body the IAAF, the Turkish Athletic Federation (TAF), and Cakir-Alptekin.
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"Ms Cakir-Alptekin is found to have committed a second anti-doping violation, after a first one committed in 2004, and shall serve a period of ineligibility of eight years, to expire at midnight on 9 January 2021," CAS said in a statement.
"Furthermore, all competitive results obtained by the athlete from 29 July 2010 onwards are disqualified, and all related titles, awards, medals, points and appearance money are forfeited."
Cakir-Alptekin won Olympic gold in the 1500m in London, and then took the title at the European Championships in Helsinki later that year.
In January 2013, the IAAF charged her with an anti-doping violation on the basis of her biological passport. She was cleared by the TAF's disciplinary board but that decision was challenged by the IAAF, who took the case to CAS.
The parties chose to negotiate a settlement before a hearing took place.
The conclusion to the case comes amid a series of allegations of doping in athletics as part of an investigation by The Sunday Times and German broadcaster ARD.
Last week, the IAAF announced it was suspending 28 athletes as a result of suspicious findings in doping tests.