Kingsguard

The Kingsguard, also known as the White Cloaks or the White Swords, is a sworn brotherhood of seven knights appointed the task of protecting the king of Westeros, the royal family and their guests.

This series isn't chapter-gated yet, so we can't hide individual spoilers. To keep you safe, everything past the intro stays hidden. If you've finished it, “Show everything” above reveals it all.