Full Idea
There may be a semantic relationship between 'Cicero' and 'Cicero' that does not hold between 'Cicero' and 'Tully', despite the lack of an intrinsic semantic difference between the names themselves.
Clarification
'Cicero' and 'Tully' are names of the same person
Gist of Idea
Cicero/Cicero and Cicero/Tully may differ in relationship, despite being semantically the same
Source
Kit Fine (Semantic Relationism [2007], 2.E)
Book Reference
Fine,Kit: 'Semantic Relationism' [OUP 2007], p.51
A Reaction
This is the key idea of Fine's book, and a most original and promising approach to a rather intractable problem in reference. He goes on to distinguish names which are 'strictly' coreferential (the first pair) from those that are 'accidentally' so.