List of Spanish regents
Reign of Charles I
Table:
Image

Personal
Coat of Arms

Name

Regency start

Regency end

Regencies (Governor of the Realms) during Charles I's absences.[2]

Cardinal Adriaan Florenszoon Boeyens

May 1520

July 1522
King Charles I's arrival.

Empress Isabella

July 1529

April 1533
King Charles I's arrival.

Empress Isabella

April 1535

December 1536
King Charles I's arrival.

Empress Isabella

July 1538

November 1539

Prince Philip[3]

1539
Death of Empress Isabella.

November 1541
King Charles I's arrival.

Prince Philip

May 1543

1548

Archduke Maximilian[4]
and
Maria of Austria

1 October 1548
Charles I and Prince Philip's absences.

12 July 1551
Prince Philip's arrival.

Prince Philip

12 July 1551

July 1554

Joanna of Austria, Princess Dowager of Portugal

July 1554
Charles I and Prince Philip's absences.

8 September 1559
King Philip II's arrival.
(Became monarch in 1556)

Per the details in the table information on the 'Reign of Charles I' part of 'List of Spanish regents', draft a brief sentence that explains what the highlighted cells show and format it within the following JSON object {"answer": "YOUR ANSWER"}.