King Charles and his troublesome younger brother, Prince Andrew, have reached a compromise in private, The Post understands.

The disgraced Duke of York, 65, was once again excluded from Monday’s Garter Day ceremony for the fourth consecutive year.

The royal sit-out occurred shortly after the Trooping the Colour ceremony for this year. Prince Andrew, along with his daughters, Princesses Beatrice and Eugenie, did not take part in the event.

While Andrew skipped out on the events, which are strictly reserved for working members of the Firm, it doesn’t mean that his brother had excluded him altogether.

According to reports, Andrew — who has been a Garter Knight since 2006 — secretly joined other members of the order for the behind-closed-doors lunch and investiture on Monday.

“[Andrew] won’t participate in the procession but he has been invited to the lunch and investiture,” a source told the Express.

His under-wraps inclusion is seen as a compromise by both sides, the insider added.

Garter Day — or Order of the Garter — was founded by King Edward III in 1348 and is the most senior and the oldest British Order of Chivalry, according to the British Museum. 

In addition to the king and queen, the Prince and Princess of Wales were in attendance, alongside Knights and Ladies personally chosen by the monarch.

It’s been widely reported that both Charles and future king, Prince William, are keen to limit Andrew’s public appearances with the rest of the royals.

Since 2022, rules have been tightened so that only working members of the royal family and their young children are allowed to attend Trooping the Colour in an official capacity.

When Andrew stepped down as a working royal shortly after his friendship with convicted pedophile Jeffrey Epstein came to light, he was kept at an arm’s length by Charles and the rest of the Windsor clan.

As a result, Andrew has not taken part in Trooping the Colour and Garter Day since 2022 — the year his mother Queen Elizabeth II died.

Still, it’s said that the monarch, 76, talks to Andrew behind closed doors, but rarely invites him to official royals events.

Andrew’s last public outing was on Easter Sunday when he joined the rest of the royals at St George’s Chapel in Windsor.