3 important events happened on this day in Chelsea history

May 15th seems like any ordinary date, but it's actually a pretty historic one in Chelsea's history books. These three things happened:

1. 2013 Europa League Champions

<blockquote class="twitter-tweet" lang="en"><p lang="en" dir="ltr">Two years ago today, Chelsea won the Europa League after beating Benfica 2-1 in Amsterdam... <a href="https://twitter.com/hashtag/CFC?src=hash">#CFC</a> <a href="http://t.co/zyjAt3dRUP">pic.twitter.com/zyjAt3dRUP</a></p>&mdash; Chelsea FC (@ChelseaFC) <a href="https://twitter.com/ChelseaFC/status/599161605264388097">May 15, 2015</a></blockquote>

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2. 2010 FA Cup Champions

<blockquote class="twitter-tweet" lang="en"><p lang="en" dir="ltr">On this day in 2010, we beat Portsmouth 1-0 in the FA Cup final to secure the domestic double! <a href="https://twitter.com/hashtag/CFC?src=hash">#CFC</a> <a href="http://t.co/hkNqLyFBrM">pic.twitter.com/hkNqLyFBrM</a></p>&mdash; Chelsea FC (@ChelseaFC) <a href="https://twitter.com/ChelseaFC/status/599170748796825600">May 15, 2015</a></blockquote>

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3. The signing of Michael Ballack

<blockquote class="twitter-tweet" lang="en"><p lang="en" dir="ltr"><a href="https://twitter.com/hashtag/OnThisDay?src=hash">#OnThisDay</a> in 2006, <a href="https://twitter.com/ChelseaFC">@ChelseaFC</a> moved swiftly to sign German star Michael <a href="https://twitter.com/Ballack">@Ballack</a>. More: <a href="http://t.co/kwKuHfPS5D">http://t.co/kwKuHfPS5D</a> <a href="http://t.co/LyQL5jHG1k">pic.twitter.com/LyQL5jHG1k</a></p>&mdash; Premier League (@premierleague) <a href="https://twitter.com/premierleague/status/599134822242496512">May 15, 2015</a></blockquote>

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Have you been around for all of these milestones? Do you have any special memories of one in particular?