It's been 20 years since Charles was finally able to marry the love of his life, but his wedding to Camilla featured a bout of sinusitis, an unhappy son, and a requirement that they both apologise to God for their behaviour.

"Laughing at the same things, getting on with life," the Queen told reporters during their state visit to Italy, per 'Hello!' magazine

As their majesties continue their tour of Italy, a royal commentator provides insight into how they have made their 20-year marriage work.