The Blues won their fifth league title last weekend, after beating Crystal Palace 1-0.
With Chelsea's recent sealing of their fourth Premier League triumph at the weekend, with three games to spare, the Blues moved ahead of London rivals Arsenal to become the team with the second most Premier League wins.
That prospect would have looked unlikely when Arsenal won their most recent title, the unbeaten 2003-04 season. At that point, Chelsea hadn't won the league since 1955. However, with the financial backing of Roman Abramovich, and the imminent arrival of Jose Mourinho from Porto, the West Londoners would win the league in 2004-05 with a record 95 points. That total has yet to be beaten.
Chelsea have won three more titles in the ten years since that the first championship under Mourinho, including this season, where the Portuguese has returned league glory to Stamford Bridge. Arsenal, in contrast, finished second in 2005, but haven't been in the top two since then. They are looking to do again this season.
It also means former Real Madrid manager Mourinho has as many league titles in five years as Arsene Wenger does in nineteen.
Though the Blues are in the lead in the Premier League title stakes, they are some way behind Arsenal historically, with just one league title win before the modern football era. The Gunners, on the other hand, have thirteen overall.
The two London clubs have a lot of catching up to do before they reach Manchester United's impressive Premier League total of thirteen championships, but unless the Red Devils win the league next season, it will have been the longest they have gone without a league championship since the division began in 1993.