WARNING: This article contains spoilers from The Crown.

The Crown introduces Dr Andrew Gailey when Prince William returns to Eton College but who is he?

Prince William (played by Ed McVey) returns to the prestigious boarding school just four days after his mum Princess Diana's (Elizabeth Debicki) funeral, despite his dad King Charles' (Dominic West) reservations.

He is welcomed back by his housemaster Dr Andrew Gailey (Blake Ritson) and is seen again when the Netflix royal drama skips to a few months later.

Gailey is seen having a private conversation with William, trying to get him to open up about how he's feeling but despite his best efforts, the young prince doesn't want to share.

It is clear Gailey is disappointed he doesn't feel like he can be honest but doesn't try to push him any further.

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Dr Andrew Gailey taught in the history department at Eton College since 1981 and was a housemaster from 1993 until 2006.

A graduate of St Andrew's and the University of Cambridge, Gailey is also a respected author who has published a plethora of history books, including Ireland and the Death of Kindness and Crying in the Wilderness: Jack Sayers, a liberal editor in Ulster.

It is believed he is married and has one daughter, although their names have been kept out of the spotlight.

Gailey does mention in The Crown having a wife who suffered with leukaemia but it isn't clear if this was the case in real life as he hasn't opened up publicly about his life.

While Gailey no longer teachers at Eton, he is the Vice-Provost and a Fellow of the College.

He remains very well-respected with MP Jacob Rees-Mogg once describing him as "a man of the utmost propriety and integrity".

A former Eton College also told Finito World: "He was an excellent housemaster, a wonderful man and someone who I will respect for the rest of my life."

It is clear he has a place in the Royal Family's hearts as Gailey attended the weddings of both Prince William and Kate Middleton and Prince Harry and Meghan Markle.

In addition to this, he was awarded the title of Commander of the Royal Victorian Order (CVO), by the Queen.

In terms of his work, his most recent book The Lost Imperialist: Lord Dufferin, Memory and Mythmaking in an Age of Celebrity, won the 2016 Elizabeth Longford Prize for Historical Biography.

It is now believed he is working on another book about Frances Horner who was the muse of the pre-Raphaelite Edward Burne Jones and leading light of the elite group The Souls.

The Crown is available to watch on Netflix.