Which nut is the primary ingredient in the sweet pastry cream known as frangipane?

Almond

Frangipane is a rich, almond-based pastry cream used in desserts like the English Bakewell tart and French Pithivier. It is named after the 16th-century Italian Marquis Muzio Frangipani, who originally created an almond-scented perfume used to fragrance leather gloves.