Brady Tkachuk is the current captain for the Sens. Before him, Erik Karlsson led the team, he is now a defenseman for the Penguins. Before Karlsson, the Sens had Jason Spezza, who is now the assistant general manager of the Penguins. And before him, Sens captain was Daniel Alfredsson, who is now an Assistant Coach for Ottawa. 

Pretty cool if you think about it!