\pgfkeys{
  /timechart/.cd,
  julioclaudian/.style={
    interval bar color=red!70!black,
    interval mark color=red!70!black!50!white
  },
  fouremperors/.style={
    interval bar color=green!65!black,
    interval mark color=green!65!black!50!white
  },
  flavian/.style={
    interval bar color=yellow!85!black,
    interval mark color=yellow!85!black!50!white
  },
  nervaantonine/.style={
    interval bar color=blue!80!black,
    interval mark color=blue!80!black!50!white
  },
  fiveemperors/.style={
    interval bar color=green!50!black,
    interval mark color=green!50!black!50!white
  },
  severan/.style={
    interval bar color=orange!80!black,
    interval mark color=orange!80!black!50!white
  },
  thirdcentury/.style={
    interval bar color=green!35!black,
    interval mark color=green!35!black!50!white
  },
  tetrarchy/.style={
    interval bar color=purple!70!black,
    interval mark color=purple!70!black!50!white
  },
  constantinian/.style={
    interval bar color=blue!65!white,
    interval mark color=blue!65!white!50!white
  },
  valentinianic/.style={
    interval bar color=orange!60!black,
    interval mark color=orange!60!black!50!white
  },
  theodosian/.style={
    interval bar color=cyan,
    interval mark color=cyan!50!white
  },
  theodosian-east/.style={
    interval bar color=cyan!80!black,
    interval mark color=cyan!80!black!50!white
  },
  theodosian-west/.style={
    interval bar color=cyan!80!white,
    interval mark color=cyan!80!white!50!white
  },
  leonid/.style={
    interval bar color=purple!40!white,
    interval mark color=purple!40!white!50!white
  },
  justinian/.style={
    interval bar color=orange!60!white,
    interval mark color=orange!60!white!50!white
  },
  lastwest/.style={
    interval bar color=green!25!black,
    interval mark color=green!25!black!50!white
  },
}
