Alexios I (1810 - 1865) was King of Nicaea and Co-Regent of Constantinople from 1823 to 1865. He was the oldest son of Romanos I and his wife Theodora Psellina, and older brother and predecessor of Romanos II. He married Zoe Marina, and had a son with her called Ioannes, who would die before succeeding to the throne.
Alexios died in 1865, and was succeeded by his younger brother, who became Romanos II.
Titles and styles
- 1810 - 1823 His Royal Highness The Crown Prince of Nicaea
- 1823 - 1865 His Royal Majesty The King of Nicaea
- 1823 - 1865 His Imperial Majesty The Co-Regent of Constantinople
|Crown Prince of Nicaea|
|1810 - 1823||Succeeded by:|
|King of Nicaea |
and ex officio Co-Regent of Constantinople
|1823 - 1865||Succeeded by:|