Tobias Buck, FT Madrid bureau chief, looks at the monarchy of King Juan Carlos: his success steering Spain to democracy; recent growing unpopularity due to criminal probes and the economic crisis; and the pressure on his successor Crown Prince Felipe.<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Subscribe to the Financial Times on YouTube; http://goo.gl/vUQx5k<br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes