List of Portuguese monarchs by age at accession to the throne

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In 1578, after the death of his grandnephew Sebastian, Cardinal Henry of Portugal, aged 66 became the oldest man to become King of Portugal. 17- Rei D. Henrique - O Casto.jpg
In 1578, after the death of his grandnephew Sebastian, Cardinal Henry of Portugal, aged 66 became the oldest man to become King of Portugal.
In 1557, 3-year-old Prince Sebastian became the youngest King of Portugal ever. Alonso Sanchez Coello 009.jpg
In 1557, 3-year-old Prince Sebastian became the youngest King of Portugal ever.

This is a list of Portuguese monarchs' ages at the time they became kings or reigning queens. For Maria II of Portugal, who was queen during two non-consecutive terms, the age at the start of the first term is given. The median age for a monarch to ascend the throne is 28 years and 296 days.

OO = Order of Office    Y = Years    D = Days    R = Rank
OONameYDDate of birthTerm beganR
17 Cardinal-King Henry 6618531 January 15124 August 15781
19 (18) Philip I (II of Spain) 5333121 May 152717 April 15812
18 [1] António, Prior of Crato [2] 48
49
206
205
153124 July 15803/4
28 (27) John VI [3] 4831213 May 176720 March 18164/3
27 (26) Maria I 429717 December 173424 March 17775
11 Edward 4128731 October 139114 August 14336
5 Afonso III [4] 381835 May 12104 November 12487
8 Peter I 37308 April 13208 May 13578
22 (21) John IV 3625719 March 16041 December 16409
26 (25) Joseph I 36556 June 171431 July 175010
24 (23) Peter II [5] 3513926 April 164812 September 168311
7 Afonso IV 343658 February 12907 February 132512
2 Sancho I 312511 November 11546 December 118613
1 Afonso I Henriques [6] 30025 July 110925 July 113914
10 John I 2736011 April 13576 April 138515
29 (28) Pedro IV
(I of Brazil)
2714912 October 179810 March 182616
3 Afonso II 2633823 April 118526 March 121217
13 John II [7] 261183 May 145529 August 148118
34 (33) Carlos I 262128 September 186319 October 188919
14 Manuel I 2535931 May 146925 May 149520
31 (30) Miguel [8] 2525926 October 180211 July 182821
33 (32) Luís I 231131 October 183811 November 186122
9 Ferdinand I 217931 October 134518 January 136723
20 (19) Philip II
(III of Spain)
2015214 April 157813 September 159824
15 John III 191897 June 150213 December 152125
35 (34) Manuel II 187815 November 18891 February 190826
6 Denis 171309 October 126116 February 127927
25 (24) John V 174822 October 16899 December 170628
32 (31) Pedro V 166016 September 183715 November 185329
21 (20) Philip III
(IV of Spain)
153578 April 160531 March 162130
4 Sancho II 131988 September 120925 March 122331
23 (22) Afonso VI 137721 August 16436 November 165632
30 (29) Maria II [9] 7284 April 18192 May 182633
12 Afonso V 623715 January 14329 September 143834
16 Sebastian 314220 January 155411 June 155735

Notes and references

  1. António, Prior of Crato is considered by some historians to be the 18th monarch. From 1580, all other monarchs have the alternative numbering between parenthesis.
  2. António's precise date of birth is unknown. The dates presented reflect the possible ages between 1 January 1531 and 31 December 1531.
  3. John VI assumed the regency on 10 February 1792, aged 24y 273d, after his mother Queen Maria I became mad. He was effectively the 22nd oldest person to run the country.
  4. Afonso III exiled his brother Sancho II to Castile, and assumed the regency on 24 July 1245, aged 35y 80d. He was effectively the 11th oldest person to run the country.
  5. Peter II de facto removed his brother Afonso VI of the throne, assuming the regency for the rest of his brother's reign. He was 19y 212d, and was effectively the 25th oldest person to run the country.
  6. The date of his accession in the table is Afonso's declaration of independence after the Battle of Ourique in 1139, and his consequent acclamation. However, Afonso Henriques was the de jure ruler of what is today Portugal when his father Henry, Count of Portugal died on 24 April 1112, when he was only 2y 274d, making him the youngest ruler of the Portuguese territory. His mother declared herself Queen of Portugal and ruled the county until the Battle of São Mamede on 24 July 1128, when Afonso was 18y 365d. If 1128 is accounted for the date of his accession, Afonso Henriques would be the 26th oldest monarch. If 1143, with the Treaty of Zamora, is considered the date of Afonso's accession to the throne he would be the 11th oldest monarch.
  7. John's father Afonso V abdicated briefly on 11 November 1477, and John consequently became king aged 22y 192d. Afonso would later return to the throne 4 days later. If 1477 is accounted as the date of John's accession, then he would be the 22nd oldest monarch.
  8. After his brother Pedro IV's abdication, and the appointment of his niece Maria II to the throne, Miguel assumed the regency on 2 May 1826. He was 23y 188d, and was effectively the 23rd oldest monarch. He would later proclaim himself king 2 years later.
  9. Maria II succeeded her father Pedro IV of Portugal, who was also Emperor of the recently independent Brazil, after his abdication on 2 May 1826. However, she never set foot in mainland Portugal, and her uncle Miguel usurped the throne and triggered a civil war. With the end of the war, Maria was again acclaimed queen on 26 May 1834, aged 15y 52d. She would be the 31st oldest monarch.

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