This temporal remnant of Doctor Strange was created during the sorcerer's early years. As a contingency plan in case of his murder, Strange severed one week from his personal timeline and hid it in secret.
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History
If Strange were to die, the remnant would be liberated and spend its one-week existence to ensure Strange's affairs were put in order and his killer brought to justice. Many years following the remnant's creations, it was finally liberated when Strange was ambushed and murdered at his Sanctum Sanctorum.
Strange soon figured out that the murderer was Kaecilius, and he used a healing spell on him to resurrect the original Doctor Strange as Kaecilius had given himself both Strange's soul and his hands.
The Temporal Remnant later sacrificed itself by flying his astral form into the Peregrine Child to ignite the semi-digested magical energies within its stomach.
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The creation of this of temporal remnant Doctor Strange is likely set between Strange Tales #127–128. He sports the attire worn by Strange between Strange Tales #110–127, before the Ancient One gifted him the Eye of Agamotto and Cloak of Levitation at the end of issue #127, which Strange first appears wearing in issue #128. In Death of Doctor Strange #2, he recognizes Clea, whom Strange first encountered in the two-part story of Strange Tales #126–127.