GATE 13 (Greek: Θυρα 13, Thyra 13) is a group of supporters of Greek club Panathinaikos A.O.. Officially founded on November 19, 1966, Gate 13 is the oldest supporters' group in Greece. Gate 13 has members from all over Greece and has over the years become a part of the club by affecting club decisions and by following the club on all possible occasions.
Before the foundation of Gate 13 there were various football supporters' clubs all around Greece. The first of these clubs was founded in October 1952 and was called S.F.O.P. (Greek: Σ.Φ.Ο.Π., Σύλλογος Φιλάθλων Οπαδών Παναθηναϊκού, Sylogos Filathlon Opadon Panathinaikou, Panathinaikos Supporters' Club) and stayed active for an unknown amount of time. Towards the end of the 50s, supporters started getting organized as far as the home and away match support. They started attending the matches regularly and always met at the 13th gate of the Apostolos Nikolaidis Stadium. In order to organize trips for away matches and other events the various clubs used to write in 2 newspapers most read by Panathinaikos fans of the time, Athlitiki Iho (Greek: Αθλητική Ηχώ, Athletic Echo) and Panathinaika Nea (Greek: Παναθηναϊκά Νέα, Panathenaic News). By 1966 there were a number of supporters' clubs, all named by the area where they were based. Notable clubs include: Ampelokipi[disambiguation needed], Zografou, Patissia, Gizi, Petralona, East End, Peristeri, Nikaia-Koridallos, Patra and many more, most of which are still active today. Despite the lack of a universal name, the clubs would often meet to discuss various things including the team's performance and management, various trips for away matches and securing tickets for the often full leoforos stadium (nickname for the Apostolos Nikolaidis Stadium). Since 1962–63 there had been thoughts of founding a universal club under the name of the stadium's gate where the team's most devoted supporters met but at the time there were many difficulties. Slowly the name Gate 13 was starting to get recognized and respected from players and fans.
Then, in 1966, after much effort the Syndesmos Filon Panathinaikou Athlitikou Omilou "I Thyra 13" (Greek: Σύνδεσμος Φίλων Παναθηναϊκού Αθλητικού Ομίλου "Η Θύρα 13", Club of Fans of Panathinaikos Athletic Club "Gate 13") first operated on November 19, 1966, on 68, Kolonos Road in Athens. At the time this was a club like all the rest, the difference was of course that its name would become a major part of Panathinaikos' history. On November 27, 1966, a few days after the foundation of Gate 13, a bus carrying Panathinaikos fans from Athens to Veroia crashed resulting to the death of two Panathinaikos fans, Giorgos Koskoros (Greek: Γιώργος Κόσκορος) and Dimitris Sarantakos (Greek: Δημήτρης Σαραντάκος) who was one of the founding members of Gate 13.
In 1967 the supporters' clubs of Panathinaikos were increasing in number in Athens and in the rest of Greece. But in 1967 the Greek military junta of 1967–1974 was established and that had an immediate effect on supporters' clubs as one after the other they were closing down. So did Gate 13, only to reopen in 1968 with new offices on 39, Sokratous street in the center of Athens. Many other clubs followed shortly. At that time, the situation inside the stadiums in Greece was very calm with fights only occasionally breaking out and were a result of personal differences. In the following years Gate 13 was expanding and flags with its name and logo started to appear in European stadiums as well as Greek ones while the Leoforos stadium was overflowing with people in the vast majority of games. An interest for basketball was growing among Panathinaikos's fans and the indoor hall of the Apostolos Nikolaidis stadium, mostly known as "The Indian's Tomb". In addition, Gate 13 would attend non sport related activities like the team's elections. At the same time they would often express their opinion on various issues that they thought negatively influenced the club, like ticket prices etc.
1971 was a key year in the history of Panathinaikos. The football team reached the 1971 European Cup Final and still is the only Greek football team ever to reach the final in a major European competition. Because of this success, Panathinaikos fans increased in numbers. Gate 13 was present in all the games of Panathinaikos in the European Cup with memorable trips to games. 15000 fans went to Belgrade to see Panathinaikos face the then very strong Red Star Belgrade while 20000 travelled to London's Wembley Stadium for the final against AFC Ajax. Because of the success of Panathinaikos's football team in Euroean Competitions, a number of supporters' clubs started reopening while other fans decided to found their own supporters' clubs. Some of the most famous new clubs were located in Nikaia, Vyronas and Thessaloniki in 1972. The Thessaloniki club was one of the most active supporters' clubs of Panathinaikos. Immediately after its foundation, the club would participate in many away games with its own coaches and would very often criticize Panathinaikos's management and owners. By 1974 most supporters' clubs had their own coaches and would be present in all away matches.
After the fall of the Greek military junta of 1967–1974 supporters' clubs started appearing all over Greece. By 1978 there were 52 Panathinaikos supporters clubs operating all over Greece at a time when arch rivals Olympiakos only had a few clubs running. In 1976, during the event for Gate 13's 10 year anniversary, Panathinaikos's fans honoured the Panathinaikos' fans that had died by keeping a minutes silence in their memory. After the change of the fans' organizer in 1974, Gate 13 remains the loudest part of the stadium and the center of all the noise was the section above the Gate 13 of the stadium where many flags and a few banners gave colour and character to the stand. Before the start of any match, all the fans wait for members of Gate 13 to invade the pitch and worship Panathinaikos's flag.