A clarification from the Pontifical Council on Christian Unity
"The title ‘Patriarch of the West’ was adopted in the year 642 by Pope Theodore. Thereafter it appeared only occasionally and did not have a clear meaning. It flourished in the sixteenth and seventeenth centuries, in the context of a general increase in the Pope’s titles, and appeared for the first time in the ‘Annuario Pontificio’ in 1863."
The term ‘West’ currently refers to a cultural context not limited only to Western Europe but including North America, Australia and New Zealand, thus differentiating itself from other cultural contexts, says the communique. "If we wished to give the term ‘West’ a meaning applicable to ecclesiastical juridical language, it could be understood only in reference to the Latin Church." In this way, the title "Patriarch of the West," would describe the Bishop of Rome’s special relationship with the Latin Church, and his special jurisdiction over her.
"The title ‘Patriarch of the West,’ never very clear, over history has become obsolete and practically unusable. It seems pointless, then, to insist on maintaining it. Even more so now that the Catholic Church, with Vatican Council II, has found, in the form of episcopal conferences and their international meetings, the canonical structure best suited to the needs of the Latin Church today."