The river Kladeos flooded while Olympia was under the control of the Romans. This caused significant damage to the site, and as a result the games ceased.

The sanctuary at Olympia (Ολυμπία) is positioned in a serene and fertile valley between the Alpheios and the Kladeos rivers in western Peloponnese, in Elis. It was the host of the Olympic games for a thousand years in antiquity. For the ancient Greeks, the Olympic games existed since mythical times, but no definitive time of their inauguration can be identified with any certainty. The first Olympiad was held in 776 BCE, and this is the year that provides the first accurate chronology of Greek history. The Olympics were held every four years during the second (or possibly the first) full moon in August, and the festivities lasted five days.

This is another tough one to answer quickly. In Greek, the letter K is "Kappa" - the hard K sound. In Latin, there was no "K". They used the letter "C" for this sound. For some reason, as Latin changed, the hard "K" was replaced with the soft "S" sound. As an example, we pronounce Cicero as "SIS-er-oh" when in fact, it was "KIK-er-oh".

So, most of the Greek mythological names have been "Latinized", so that the Romans would understand their meaning. Whenever there was a "K", it usually becomes a "C" when Latinized (unless it starts with CH, which is actually the letter Chi or "X"). Those names that start with K were ones not observed by the Romans.

As an example, Cronus was actually Kronos. Here are the ones I know:

Coeus (Κοῖος - Koios), Crius (Κρεῖος - Kreios), Clymene (Κλυμένη - Klemene), Cottus (Κόττος - Kottos), Caerus (Καιρός - Kairos), Corus (Κόρος - Koros), Kakia (Kακία), Kalokagathia (Καλοκαγαθία), The Keres (Κῆρες), Koalemos (Κοάλεμος), Kratos (Κράτος), Kydoimos (Κυδοιμός), Clotho (Κλωθώ - Klotho), Cerberus (Κέρβερος - Kerberos), Keuthonymos (Κευθόνυμος), Kokytos (Kωκυτός), Ceto (Κῆτώ - Keto), Cymopoleia (Κυμοπόλεια - Kymopoleia), Karkinos (Καρκίνος), Celaeno (Κελαινώ - Kelaino), Cabeiri (Κάβειροι - Kabeiroi), The Cercopes (Κέρκοπες - Kerkopes), Comus (Κόμος - Komos), Corymbus (Κόρυμβος - Korymbos), The Curetes (Κουρέτες - Kouretes), Cybele (Κυβέλη - Kybele), Cladeus (Κλάδεος - Kladeos), Cocytus (Kωκυτός - Kokytos), and of course, the Cyclopes (Κύκλωπες - Kyklopes)