

The Inventor of the Mortar: Mehmed the Conqueror
When Mehmed the Conqueror and his Ottoman army besieged Constantinople, they encountered a major obstacle: the Galata Tower built by the Romans and Genoese, and the massive Golden Horn chain. While Mehmed the Conqueror, besieging the city with a vast army on land, was making strides against the Theodosius Walls using the 'Şahi' cannons built by Urban the Hungarian, the Venetian-Genoese reinforcements arriving by sea achieved success against the Ottoman navy, managing to sink a portion of it. This caused great demoralization for both the Sultan and his army. Mehmed rode his horse to the water's edge, but after being stopped by his commanders, he turned back to the land.
When Mehmed the Conqueror turned his horse away from the shore, he was no longer thinking merely as a commander, but as an engineer. The helplessness of a navy unable to cut off the aid coming by sea drove him to achieve the impossible: a cannon capable of vertical strikes, targeting ships and the defense line inside the Golden Horn by soaring over the walls. To strike the Byzantine-Genoese ships protected by the Galata walls and the massive chain closing the Golden Horn, Mehmed changed the elevation of his cannons.
He personally calculated that cannons did not have to fire in a straight line and that, by correctly calculating the explosive power of the gunpowder and the center of gravity of the cannonball, a 'trajectory' could be achieved. Together with Urban, they raised the cannon carriages. This marked the emergence of the modern mortar system on the stage of military history.
He placed the cannons on the hills of Pera (modern-day Beyoğlu slopes). The walls were no longer an obstacle, as these cannons did not hit the walls; instead, they arched over them, falling directly onto the ships in the Golden Horn. The decks of the ships had no protection against the vertical impact of these massive cannonballs. Seeing this, the Venetian-Roman-Genoese ships immediately pulled into the port of the Galata Tower, attempting to use it as a 'shield,' and were unable to venture out from under the protection of Galata for the remainder of the war. While it is historically recorded that one large ship was sunk in this event, it is also said that several smaller ships were sunk as well.
Sources: Kritovulos (Michael Kritovoulos), Dukas History, Tursun Bey (Tarih-i Ebü'l-Feth.)