Looking on the internet deeply has found these results:

In service of the crown is the most popular phrase on the web.

In service of the throne 12 results on the web	In service of the crown 11,360 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
May 22, 2014 ... French Princesses 'In Service of the Throne' (& Themselves) Maria Spencer Wendeln, Wayne State University Am I not a Sister and a Woman? Most of his energy and time is spent in service of the throne, managing the affairs of King Leontes. Camillo dances between the line of furtiveness and integrity,�...	... of imprisonment(sometimes death), but took the option to have their sentences commuted to a shorter period of exile overseas, in service of the crown. In Crete , he put many notches on his belt with brilliant covert exploits in service of the Crown, for which he was later knighted. He also left a long trail of broken�... In 1556, he instituted regulations on the obligations of the boyar class in service of the crown. In foreign policy, Ivan IV had two main goals: to resist the Mongol�... Eight hundred Aragonese horse, many of them Castilian exiles in service of the Crown of Aragon under Henry of Trast�mara, had launched a cavalgada in�...

In service of the throne

12 results on the web

In service of the crown

11,360 results on the web

More popular!

May 22, 2014 ... French Princesses 'In Service of the Throne' (& Themselves) Maria Spencer Wendeln, Wayne State University Am I not a Sister and a Woman?
Most of his energy and time is spent in service of the throne, managing the affairs of King Leontes. Camillo dances between the line of furtiveness and integrity,�...

... of imprisonment(sometimes death), but took the option to have their sentences commuted to a shorter period of exile overseas, in service of the crown.
In Crete , he put many notches on his belt with brilliant covert exploits in service of the Crown, for which he was later knighted. He also left a long trail of broken�...
In 1556, he instituted regulations on the obligations of the boyar class in service of the crown. In foreign policy, Ivan IV had two main goals: to resist the Mongol�...
Eight hundred Aragonese horse, many of them Castilian exiles in service of the Crown of Aragon under Henry of Trast�mara, had launched a cavalgada in�...