Which TV special came first, "Rudolph the Red-Nosed Reindeer" or "A Charlie Brown Christmas"?

The TV special “Rudolph the Red-Nosed Reindeer” appeared first, in December 1964.

“Charlie Brown” followed in 1965.

Since then, both have appeared annually at Christmas time on CBS.

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Which TV special came first, “Rudolph the Red-Nosed Reindeer” or “A Charlie Brown Christmas”?