A prima facie case is a situation, case or defense that is without a shadow of doubt established by a party's evidence to justify a verdict in his or her favor, as long as such evidence is not rebutted by the other party.
Prima facie is all about an evidence that is good and sufficient on its face value to establish a given fact or to prove a case
Fall of Constantinople, (May 29, 1453), conquest of Constantinople by Sultan Mehmed II of the Ottoman Empire. The fall of the city removed what was once a powerful defense for Christian Europe against Muslim invasion, allowing for uninterrupted Ottoman expansion into eastern Europe.