He is a Forsyte and this explains everything

Look! He looks a Byron!

No article is used before nouns denoting military ranks and titles such as academician, professor, doctor, colonel, etc., followed by names of persons:

Colonel Pickering, Mayor Brown, Doctor Smith, etc.

Note: Common nouns denoting professions followed by names of persons usually take the definite article: the painter Turner.

If the name of the person is always used with the noun denoting profession, it becomes a set expression and is used without any article:

Judge Brown, Agent Murphy.

If the name of a person is used to denote a work of art that belongs to that person, the article is used with it like with a common noun:

I think this picture is a Rembrandt.

Have you seen the Rembrandt exhibited in this museum?

THE USE OF ARTICLES WITH PERSONAL NAMES MODIFIED BY ATTRIBUTES

1. The definite article is used with personal names modified by descriptive adjectives:

At last we met the famous John Brown.

I wasn't acquainted with the late Mr. Gray.

2. No article is used if the personal name is modified by the adjectives old, young, little, dear:

Little Mary is asleep in her room.

Young John was a copy of his mother.

3. The indefinite article is used if the adjective modifying the personal name denotes the mood of the person:

We watched a silent Mary with interest.

4. The definite article is used with personal names modified by limiting attributes:

He was not the Alex of our youth.

5. The indefinite article is used when the personal name is modified by the adjective certain:

Sherlock Holmes was told that a certain Mary Green was waiting for him.

6. Personal names can turn into common nouns to denote things associated with the names of certain persons. In these cases they take articles according to the general rule of the use of articles with common nouns:

Aunt, you are a real Miss Marple.