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What types of hereditary peers existed?
Types of hereditary peers included the Labour hereditary peers, the Conservative hereditary peers, the Liberal Democrat hereditary peers, and the crossbench hereditary peers.
What is the definition of Conservative hereditary peer?
Conservative hereditary peer is a hereditary peer belonging to the Conservative Party, a centre-right political party in the United Kingdom.

Question: What is the role of a hereditary peer?
Self-contained rewrite: What is the role of a hereditary peer?