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Manfred, Prince of Taranto, regent of Sicily 1254-1258, King of Sicily 1258-1266, was an illegitimate son of Emperor Frederick II.

Enzio, an illegitimate half brother of Manfred, married the heiress of part of Sardinia and was appointed King of Sardinia by Emperor Frederick II.

In Medieval Wales illegitimate sons who were acknowledged by their fathers had an equal right to inherit as legitimate sons. The mothers of many Welsh kings are not known and When they are known it is often not known if they were the wives or mistresses of their fathers. Nobody knows the proportion of legitimate and illegitimate sons among the Welsh kings.

And similarly there was a high proportion of illegitimate birth among the medieval Irish kings. Since there were more kingdoms in medieval Ireland than in all the reset of Europe, it is possible that most medieval European kings were bastards.

King Alfonso V (1396-1458) of Aragon etc. Left Aragon and Sicily to his legitimate brother King John II of Aragon, Sicily, etc., and his other kingdom of Sicily to his illegitimate son Ferdinand I (1423-1494)

And I have a longer list in my anser to this question:

Why couldn't bastards inherit titles?1

Manfred, Prince of Taranto, regent of Sicily 1254-1258, King of Sicily 1258-1266, was an illegitimate son of Emperor Frederick II.

Enzio, an illegitimate half brother of Manfred, married the heiress of part of Sardinia and was appointed King of Sardinia by Emperor Frederick II.

In Medieval Wales illegitimate sons who were acknowledged by their fathers had an equal right to inherit as legitimate sons. The mothers of many Welsh kings are not known and When they are known it is often not known if they were the wives or mistresses of their fathers. Nobody knows the proportion of legitimate and illegitimate sons among the Welsh kings.

And similarly there was a high proportion of illegitimate birth among the medieval Irish kings. Since there were more kingdoms in medieval Ireland than in all the reset of Europe, it is possible that most medieval European kings were bastards.

King Alfonso V (1396-1458) of Aragon etc. Left Aragon and Sicily to his legitimate brother King John II of Aragon, Sicily, etc., and his other kingdom of Sicily to his illegitimate son Ferdinand I (1423-1494)

Manfred, Prince of Taranto, regent of Sicily 1254-1258, King of Sicily 1258-1266, was an illegitimate son of Emperor Frederick II.

Enzio, an illegitimate half brother of Manfred, married the heiress of part of Sardinia and was appointed King of Sardinia by Emperor Frederick II.

In Medieval Wales illegitimate sons who were acknowledged by their fathers had an equal right to inherit as legitimate sons. The mothers of many Welsh kings are not known and When they are known it is often not known if they were the wives or mistresses of their fathers. Nobody knows the proportion of legitimate and illegitimate sons among the Welsh kings.

And similarly there was a high proportion of illegitimate birth among the medieval Irish kings. Since there were more kingdoms in medieval Ireland than in all the reset of Europe, it is possible that most medieval European kings were bastards.

King Alfonso V (1396-1458) of Aragon etc. Left Aragon and Sicily to his legitimate brother King John II of Aragon, Sicily, etc., and his other kingdom of Sicily to his illegitimate son Ferdinand I (1423-1494)

And I have a longer list in my anser to this question:

Why couldn't bastards inherit titles?1

1
source | link

Manfred, Prince of Taranto, regent of Sicily 1254-1258, King of Sicily 1258-1266, was an illegitimate son of Emperor Frederick II.

Enzio, an illegitimate half brother of Manfred, married the heiress of part of Sardinia and was appointed King of Sardinia by Emperor Frederick II.

In Medieval Wales illegitimate sons who were acknowledged by their fathers had an equal right to inherit as legitimate sons. The mothers of many Welsh kings are not known and When they are known it is often not known if they were the wives or mistresses of their fathers. Nobody knows the proportion of legitimate and illegitimate sons among the Welsh kings.

And similarly there was a high proportion of illegitimate birth among the medieval Irish kings. Since there were more kingdoms in medieval Ireland than in all the reset of Europe, it is possible that most medieval European kings were bastards.

King Alfonso V (1396-1458) of Aragon etc. Left Aragon and Sicily to his legitimate brother King John II of Aragon, Sicily, etc., and his other kingdom of Sicily to his illegitimate son Ferdinand I (1423-1494)