Conversation so far:
Are there any other interesting aspects about Hrólfr Kraki?
Hrólfr Kraki appears in both Anglo-Saxon and Scandinavian tradition.
Who are the two sons of Haldan and what did they do?
Ro (Hroðgar) and Helgo (Halga) were the son of Haldan (Healfdene). When Haldan died of old age, they divided the Kingdom.

Question: What are the exploits of the sons?
Self-contained rewrite: What are the exploits of the sons Helga and Ro?