Please Help, need to find the pronoun and antecedent

1. Today when people buy wedding rings, they follow an age-old tradition.
2. Rich Egyptian grooms gave their brides gold rings 5,000 years ago.
3. To Egyptian couples, the ring represented eternal love; it was a circle without beginning or end.
4. By Roman times, gold rings had become more affordable, so ordinary people could also buy them. ​