Why do people call D. Pedro Square, Rossio Square?

Visitors from outside Rossio always pass through the Rossio square.
Decorated with beautiful calçada and fountains,
it shows off its beauty every day.

fountain imported from France

wave patterned  calçada

Rossio means commons.
Its original name is not Rossio square.
It is D. Pedro IV Square,
but not even Lisbonians call it that name.

Well, the reason is D. Pedro IV wasn't popular among the commons.
Because of him, there was a civil war.

You can see his statue in Porto too. 

The statue you see in Comerico square is D. Jose I.

 D. Jose I.

He suffered the Lisbon earthquake
and his daughter was D. Maria I.

D. Maria I

Withe her son Joao VI and her grandson Pedro IV,
D. Maria I left for Brazil because of Napoleon.

family tree of D. Pedro IV

Leaving her people behind was not good.
But the worst came later.
Pedro declared himself an emperor of Brazil
and became Pedro I.
He left Portugal in his daughter Maria II's care.
But as she was too young, he entrusted the nation and his daughter to his brother Miguel, who was also Maria's fiance.

Pedro IV's death

the room Pedro IV's died

the palace the king died, palacio Queluz

Miguel got greedy and decided to become the king himself.
So there was a war between the brothers.
In the end Pedro won.

People suffered a lot because of his mess.
That's why people call the square not after the king Pedro IV.
Instead, they just call it the commons square, Rossio square.