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King John was excommunicated in England
King John and Innocent were having a dispute over the next Archbishop. And then King John banished Innocent's bishop form England.
He was excommunicated
Pope Innocent III
Pope Innocent III placed the whole of England under an interdict in 1208 when King John refused to appoint the Vatican's nominee Stephen Langton as Archbishop of Canterbury. King John was excommunicated in 1209, but then made big profits from English cathedrals and monasteries after their leaders went into exile. In 1212 it was resolved John decided to accept Langton as a way of getting back in favour before an invasion of France (which turned out a disaster).
Philip Augustus of France, and King John of England
He was excommunicated by the church
Not, really he got excommunicated from the church and he also quarrelled with the pope over who should be archbishop of canterbury. Despite this he made up with the pope who helped in battle latter on.
King John's quarrel with the pope was about who they wanted to be the archbishop of Canterbury. This had an effect on England because of the quarrel the pope stop any services for 7 years this was called an interdict .
He became King after his brother Richard I died. As Richard I left no heirs John became King.
I don't know if they have been materially excommunicated, but from what I can read about the illicit ordinations, they would certainly be formally excommunicate.
You are probably asking about King John of England. There were other kings, lords of various kinds, and popes named John, but John of England was certainly most famous in English speaking lands. King John of England was the son of King Henry II and Eleanor of Aquitaine. He was disliked, and is sometimes referred to as "Bad King John." He ran afoul of the Church and was excommunicated for a time, and had to place a permanent tax on the people going to Rome as part of getting out of that trouble. He caused trouble for his nobility to the point that the barons forced him to sign the Magna Carta. There are people who defend him, but not many. There is a link to an article on him below.