– A new documentary series, Prince Charles: Inside the Duchy of Cornwall, explores the royal’s work overseeing the titular estate.

– In a clip from a new episode airing today on ITV, Charles discusses an emotional moment he had when his older son, Prince William, talking about inheriting the duchy one day.

– “Frankly, it reduced me to tears,” Charles said.

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The new ITV docu-series Prince Charles: Inside the Duchy of Cornwall offers a rare look into the Prince of Wales’s life, not only as a working royal, but also as a proud father. A new episode airing in the U.K. today includes a cameo from his eldest, Prince William, who is second in line for the throne and first in line to inherit the Duchy of Cornwall from Charles.

After hearing a conversation that William had with Mervyn Keeling, a second-generation Cornwall tenant, Prince Charles was overcome with emotion. “I saw it and I couldn’t believe it. I was deeply touched by what he said,” the prince said in a clip from the episode, released by ITV.

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What exactly did William say? He and Keeling talked about the significance of family in the process of succession. “I think it’s important, Mervyn, about the family angle. I really do,” the Duke of Cambridge says in the clip. “I’ve started to think about how I will inherit the Duchy one day and what I do.” William also noted that having children (he shares three with Kate Middleton) have influenced how he’s thought about the future role.

“Frankly, it reduced me to tears. It did really,” Prince Charles said in response to the conversation. “Because I suddenly thought, well, just hearing that from him has made all the last 50 years worthwhile.”

 

Prince William and Prince Charles at the evening reception following his wedding to Kate Middleton in 2011. Photo: Getty

As the Duke of Cornwall, Prince Charles oversees the Duchy of Cornwall estate, which is also the source of revenue for his and his children’s public works. A charter rule mandates that the position of Duke of Cornwall be held by the oldest surviving son of the monarch and heir to the throne, which means Prince William is waiting in the wings. Prince Charles has held the title for 50 years, making him the longest-serving duke to do so.

This article originally appeared on Harper’s Bazaar US.

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