Issued in miniature sheet form, these stamps supplement the long-running King and Queen stamp project. What happened during the reign of Britain's 36 monarchs? Important (and sometimes overlooked) events over six centuries are represented on four stamps from each royal household.

Stamp format/size: portrait 27mm x 37mm. Size of miniature sheet: 123mm x 70mm. Print process: lithography. Perforation: 14 × 14. Phosphor: bars. Gum: PVA. Number of stamps: 24.

Related project: Royal Mail Kings and Queens

The significant events of each royal household is represented on its own minisheet with a time line.

Special handstamps for mail issued from royal palaces also included vertical royal time lines.