The Nigeria international who joined the St Andrew's Stadium outfit on a six-month loan from Rubin Kazan in 2011, wrote his name in the club's history books as an 83rd-minute substitute at Wembley.
The former Inter Milan and Levante forward made a name for himself in Birmingham City's history with his last-gasp effort that dented the Gunners' hopes of winning their first League Cup title under Arsene Wenger.
Martins took advantage of a mix-up between defender Laurent Koscielny and goalkeeper Wojciech Szczesny to guide the Blues to their first English League Cup title in 48 years.
Seven years later, the 33-year-old who now plays for Shangai Shenhua in the Chinese Super League, joined a host of Birmingham City fans to celebrate the Cup triumph.
Happy #ObafemiDay Obafemi Martins Day everybody— Any Deeper Blue (@NebraskElectric) February 27, 2018
Just for one day we can forget about current problems and say, Happy Obafemi Martins Day #BCFC— Martin Bolton (@Martin_Bolton39) February 27, 2018