Who is Henry Mallinger Grandcourt from Daniel Deronda and what is their importance?

Henry Mallinger Grandcourt is the heir apparent to the baronetcy. He meets Gwendolyn when he comes to stay at his uncle's estate. Over time, Henry falls in love with Gwendolyn, and he later proposes to her, earning her favor by promising to provide for her mother and sisters when they are about to be reduced to living in a cottage and earning their own living. Grandcourt drowns while sailing with Gwendolyn in the Mediterranean.