Seven Citadels
The brief
Divide the grid into seven kingdoms, each consisting of seven orthogonally connected cells. Every row, column and kingdom must contain the digits 1 to 7 once each.
Every kingdom contains a Citadel (circle). The seven citadels form a set of the digits 1-7.
Digits in caged cells indicate how many cells of the same kingdom are seen orthogonally from that position, including itself. Other kingdoms block vision.
White dots lie on the boundary between two kingdoms. Additionally, they separate consecutive digits.