Throne Room / Develop might be an optimal opening in a kingdom that has Peddler, Expand, and no other (worthwhile) Actions, but also has Colony and Platinum. Maybe the kingdom looks something like:
Develop, Tunnel, Throne Room, Royal Seal, Stash, Farmland, Expand, Peddler, Transmute, Philosopher's Stone
The idea here would be to use Thrones and Develops to get Peddlers and Expands, in order to hit Colony. Though, maybe Develop / Silver or Develop / Develop would be better for that, I'm not sure.