JOSEPHO I
AUGUSTO PIO FELICI PATRI PATRIAE
QUOD REGIIS JURIBUS ADSERTIS LEGIBUS EMEMDATIS
COMMERCIO PROPAGATO MILITIA ET BONIS ARTIBUS RESTITUTIS
URBEM FUNDITUS EVERSAM TERRAEMOTU ELEGANTIOREM RESTAURAVERIT
AUSPICE ADMINISTRO EJUS MARCHIONE POMBALIO ET COLLEGIO NEGOTIATORUM CURANTE
S.P.Q.O.
BENEFICIORUM MEMOR
A. MDCCLXXV.
P.

JOACHIMUS MACHADIUS CASTRIUS FINXIT ET SCULPSIT BARTHOLOMAEUS COSTIUS STATUAM EQUESTREM EX AERE FUDIT

The monument dedicated to Jose I, King of Portugal. A statue on which the king appears riding his horse was the first statue in which a figure on a horse appears that was made in Portugal, and was also the first statue made of a person while he was alive.
The statue was made by Joaquim Machado de Castro, and it was made after the reconstruction of Lisbon from the earthquake of 1755.
The statue is placed in the Praça do Comércio which was also rebuilt after the earthquake.

The statue was photographed on the same day Click for a larger image

On the front of the monument there is a metal relief with the image of Sebastiao de Mello, Marquis of Pombal who was the minister of the kingdom (prime minister), and is actually responsible for the reconstruction of the city of Lisbon after the earthquake.
Below the image is the date:
12 DE OUTOBRO DE 1833
October 12, 1833, the date on which the relief of Marquis Pombal was restored, after it was removed in 1777.
Click for a larger image

Translation of the text on the sign:
(from Latin)
Joseph I
Augustus Pio the happy father of the patriots
which upholds the rights of the royal laws
The return of trade and military power
Administered by Marquis Pombal and the Association of Responsible Traders
S.P.Q.O.
Remember the benefits
A. 1875
P.

Joachim of Hadius created and sculpted the castle Bartholomeus Coustius casts a statue of a rider from the air