Her first name can be spelled in several ways; the spelling used in Wikipedia is shown.
Like many British aristocrats, her life was disrupted by the Civil War and Cromwell's rule. She spent considerable time in the Netherlands. Her Wikipedia article is here.

ca. 1618 Alatheia Talbot Countess of Arundel by Daniël Mijtens, (National Portrait Gallery, London UK)

1619 Alathea Talbot (c.1590–1654), Countess of Arundel and Surrey by ? (Ingestre Hall Residential Arts Centre - Stafford, Shropshire UK)

1619 Alathea Talbot, Countess of Arundel by Cornelius Janssen van Ceulen (Cornelius Johnson) (auctioned by Christie's)

1619 Portrait of a Woman (Alethea Howard, Countess of Arundel), by Cornelius Janssen van Ceulen, (Cleveland Museum of Art - Cleveland, Ohio, USA)

1620 Lady Alethea Talbot, Countess of Arundel by Peter Paul Rubens (Museu Nacional d'Art de Catalunya - Barcelona, Catalonia Spain)

1620 Lady Alethea Talbot, Countess of Arundel by Peter Paul Rubens (Museu Nacional d'Art de Catalunya - Barcelona, Catalonia Spain) necklines, partlet, tabbed sleeves, religious bodice ornament, and upper part of draped jeweled bodice ornament

1620 Lady Alethea Talbot, Countess of Arundel by Peter Paul Rubens (Museu Nacional d'Art de Catalunya - Barcelona, Catalonia Spain) hair jewelry
