To answer your question, YES. The following is from the Wikipedia and the Wikipedia has no religious agenda:
During his 2001 travels, John Paul II became the first Pope to visit Greece in 1291 years.[92][93] In Athens the Pope met with Archbishop Christodoulos, the head of the Greek Orthodox Church.[92] After a private 30 minute meeting, the two spoke publicly. Christodoulos read a list of "13 offences" of the Roman Catholic Church against the Eastern Orthodox Church since the Great Schism,[92] including the pillaging of Constantinople by crusaders in 1204, and bemoaned the lack of any apology from the Roman Catholic Church, saying “Until now, there has not been heard a single request for pardon” for the “maniacal crusaders of the 13th century.”[92]
The Pope responded by saying “For the occasions past and present, when sons and daughters of the Catholic Church have sinned by action or omission against their Orthodox brothers and sisters, may the Lord grant us forgiveness,” to which Christodoulos immediately applauded. John Paul II also said that the sacking of Constantinople was a source of “profound regret” for Catholics.[92] Later John Paul and Christodoulos met on a spot where Saint Paul had once preached to Athenian Christians. They issued a ‘common declaration’, saying “We shall do everything in our power, so that the Christian roots of Europe and its Christian soul may be preserved. … We condemn all recourse to violence, proselytism and fanaticism, in the name of religion”[92] The two leaders then said the Lord's Prayer together, breaking an Orthodox taboo against praying with Catholics.
