This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Spurinna was an Etruscan trained haruspex, a specialist in reading the internal organs of sacrificed animals for signs of what was to come, active at Rome in February of 44 BCE. When a bull was sacrificed on Julius Caesar's behalf that month, Spurinna found it had no heart at all, an omen ancient readers of entrails treated as a sign of exceptional gravity rather than an ordinary unfavorable result. A further sacrifice produced another unfavorable reading.
On the strength of those two readings, Spurinna warned Caesar directly that a danger to his life would not extend beyond the Ides of March, the fifteenth day of the month by the Roman calendar. The warning named no attacker and no specific plot, only a span of time within which Caesar's safety could not be guaranteed by the signs Spurinna had read, a form of prophecy that left Caesar's own household and allies to weigh how seriously to take it.
Caesar did not act on the warning by withdrawing from public life or cancelling his plans. He continued to attend the Senate and conduct the business of state through the weeks the warning covered, treating Spurinna's reading as one among many omens a Roman public figure of his standing routinely received rather than as a specific and actionable threat requiring a change of course.
That decision to carry on unchanged is itself part of what the sources preserve about the episode, a documented choice by Caesar to weigh Spurinna's warning against the ordinary business of governing Rome rather than a decision made in ignorance of it.