Possible Clues:

• Plotted together
• Plotted
• Plotted no end of biased reporting to divide political opponents
• Record including location for weathervane as planned
• Partnered in crime
• Intrigued to have had jointly the brainwave to exclude one
• Joke about new tower was intriguing
• Worked together
• Prisoners, with pride shattered, plotted
• Intrigued, do princes get involved?